diff --git a/src/deemon/objects/roset.c b/src/deemon/objects/roset.c
index 29a0fb7dd..b1ee52ff6 100644
--- a/src/deemon/objects/roset.c
+++ b/src/deemon/objects/roset.c
@@ -405,9 +405,9 @@ roset_iter(RoSet *__restrict self) {
 	return result;
 }
 
-PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
+PRIVATE WUNUSED NONNULL((1)) size_t DCALL
 roset_size(RoSet *__restrict self) {
-	return DeeInt_NewSize(self->rs_size);
+	return self->rs_size;
 }
 
 PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
@@ -529,17 +529,48 @@ PRIVATE struct type_cmp roset_cmp = {
 };
 
 PRIVATE struct type_seq roset_seq = {
-	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&roset_iter,
-	/* .tp_sizeob   = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&roset_size,
-	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&roset_contains,
-	/* .tp_getitem  = */ NULL,
-	/* .tp_delitem  = */ NULL,
-	/* .tp_setitem  = */ NULL,
-	/* .tp_getrange = */ NULL,
-	/* .tp_delrange = */ NULL,
-	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ NULL,
-	/* .tp_foreach  = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&roset_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&roset_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&roset_contains,
+	/* .tp_getitem                    = */ NULL,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ NULL,
+	/* .tp_foreach                    = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&roset_foreach,
+	/* .tp_foreach_pair               = */ NULL,
+	/* .tp_bounditem                  = */ NULL,
+	/* .tp_hasitem                    = */ NULL,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&roset_size,
+	/* .tp_size_fast                  = */ (size_t (DCALL *)(DeeObject *__restrict))&roset_size,
+	/* .tp_getitem_index              = */ NULL,
+	/* .tp_getitem_index_fast         = */ NULL,
+	/* .tp_delitem_index              = */ NULL,
+	/* .tp_setitem_index              = */ NULL,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
+	/* .tp_getrange_index             = */ NULL,
+	/* .tp_delrange_index             = */ NULL,
+	/* .tp_setrange_index             = */ NULL,
+	/* .tp_getrange_index_n           = */ NULL,
+	/* .tp_delrange_index_n           = */ NULL,
+	/* .tp_setrange_index_n           = */ NULL,
+	/* .tp_trygetitem                 = */ NULL,
+	/* .tp_trygetitem_index           = */ NULL,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
diff --git a/src/deemon/objects/set.c b/src/deemon/objects/set.c
index ad80ad0a7..dfea5a300 100644
--- a/src/deemon/objects/set.c
+++ b/src/deemon/objects/set.c
@@ -193,12 +193,14 @@ invset_printrepr(DeeSetInversionObject *__restrict self,
 	return DeeFormat_Printf(printer, arg, "~%r", self->si_set);
 }
 
+#ifndef CONFIG_EXPERIMENTAL_NEW_SEQUENCE_OPERATORS
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
 invset_iterself(DeeSetInversionObject *__restrict self) {
 	/* Sorry, but it's impossible to enumerate a set containing (almost) everything */
 	err_unimplemented_operator(Dee_TYPE(self), OPERATOR_ITER);
 	return NULL;
 }
+#endif /* !CONFIG_EXPERIMENTAL_NEW_SEQUENCE_OPERATORS */
 
 PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
 invset_tpcontains(DeeSetInversionObject *self, DeeObject *key) {
@@ -211,7 +213,11 @@ invset_tpcontains(DeeSetInversionObject *self, DeeObject *key) {
 }
 
 PRIVATE struct type_seq invset_seq = {
+#ifdef CONFIG_EXPERIMENTAL_NEW_SEQUENCE_OPERATORS
+	/* .tp_iter     = */ NULL,
+#else /* CONFIG_EXPERIMENTAL_NEW_SEQUENCE_OPERATORS */
 	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&invset_iterself,
+#endif /* !CONFIG_EXPERIMENTAL_NEW_SEQUENCE_OPERATORS */
 	/* .tp_sizeob   = */ NULL,
 	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&invset_tpcontains,
 	/* .tp_getitem  = */ NULL,
diff --git a/src/deemon/runtime/operator_info.c b/src/deemon/runtime/operator_info.c
index b38c68832..742c917d6 100644
--- a/src/deemon/runtime/operator_info.c
+++ b/src/deemon/runtime/operator_info.c
@@ -2052,6 +2052,7 @@ PRIVATE struct type_seq to_seq = {
 	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&to_iter,
 	/* .tp_sizeob   = */ NULL,
 	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&to_contains
+	/* TODO: tp_foreach */
 };
 
 PRIVATE struct type_member tpconst to_class_members[] = {
diff --git a/src/dex/collections/bitset.c b/src/dex/collections/bitset.c
index c2a23f9fc..a4fd9be23 100644
--- a/src/dex/collections/bitset.c
+++ b/src/dex/collections/bitset.c
@@ -39,10 +39,14 @@
 #include <deemon/util/atomic.h>
 
 #include <hybrid/bitset.h>
+#include <hybrid/limitcore.h>
 #include <hybrid/overflow.h>
 
 #include <stddef.h>
 
+#undef SSIZE_MAX
+#define SSIZE_MAX __SSIZE_MAX__
+
 /* Use <deemon/util/atomic.h> to implement atomic bitset ops (so they're faster under CONFIG_NO_THREADS) */
 #undef __hybrid_bitset_atomic_set
 #undef __hybrid_bitset_atomic_clear
@@ -245,7 +249,7 @@ struct bitset_fromseq_data {
 	                            * # of bits is stored in `bsfsd_bitset->bs_nbits') */
 };
 
-PRIVATE WUNUSED NONNULL((2)) dssize_t DCALL
+PRIVATE WUNUSED NONNULL((2)) Dee_ssize_t DCALL
 bitset_fromseq_cb(void *cookie, DeeObject *item) {
 	struct bitset_fromseq_data *me = (struct bitset_fromseq_data *)cookie;
 	DREF Bitset *bitset;
@@ -329,7 +333,7 @@ bs_init_fromseq(DeeObject *seq, DeeObject *minbits_ob) {
 
 
 PRIVATE WUNUSED NONNULL((1)) size_t DCALL
-bs_nsi_getsize(Bitset *__restrict self) {
+bs_size(Bitset *__restrict self) {
 	return bitset_popcount(self->bs_bitset, self->bs_nbits);
 }
 
@@ -646,11 +650,6 @@ bs_iter(Bitset *__restrict self) {
 	return NULL;
 }
 
-PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-bs_size(Bitset *__restrict self) {
-	return DeeInt_NewSize(bs_nsi_getsize(self));
-}
-
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
 bs_contains(Bitset *self, DeeObject *key) {
 	size_t bitno;
@@ -662,27 +661,36 @@ bs_contains(Bitset *self, DeeObject *key) {
 	return NULL;
 }
 
+PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
+bs_getitem_index(Bitset *self, size_t bitno) {
+	if unlikely(bitno >= self->bs_nbits)
+		goto err_too_large;
+	return_bool(bitset_test(self->bs_bitset, bitno));
+err_too_large:
+	bs_err_bad_index(self, bitno);
+	return NULL;
+}
+
+PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
+bs_trygetitem_index(Bitset *self, size_t bitno) {
+	if unlikely(bitno >= self->bs_nbits)
+		return ITER_DONE;
+	return_bool(bitset_test(self->bs_bitset, bitno));
+}
+
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-bs_delitem(Bitset *self, DeeObject *key) {
-	size_t bitno;
-	if (DeeObject_AsSize(key, &bitno))
-		goto err;
+bs_delitem_index(Bitset *self, size_t bitno) {
 	if unlikely(bitno >= self->bs_nbits)
 		goto err_too_large;
 	bitset_atomic_clear(self->bs_bitset, bitno);
 	return 0;
 err_too_large:
 	return bs_err_bad_index(self, bitno);
-err:
-	return -1;
 }
 
-PRIVATE WUNUSED NONNULL((1)) int DCALL
-bs_setitem(Bitset *self, DeeObject *key, DeeObject *value) {
+PRIVATE WUNUSED NONNULL((1, 3)) int DCALL
+bs_setitem_index(Bitset *self, size_t bitno, DeeObject *value) {
 	int temp;
-	size_t bitno;
-	if (DeeObject_AsSize(key, &bitno))
-		goto err;
 	if unlikely(bitno >= self->bs_nbits)
 		goto err_too_large;
 	temp = DeeObject_Bool(value);
@@ -701,7 +709,7 @@ bs_setitem(Bitset *self, DeeObject *key, DeeObject *value) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF BitsetView *DCALL
-bs_getrange_i(Bitset *self, dssize_t start, dssize_t end) {
+bs_getrange_index(Bitset *self, Dee_ssize_t start, Dee_ssize_t end) {
 	struct Dee_seq_range range;
 	DREF BitsetView *result;
 	result = DeeObject_MALLOC(BitsetView);
@@ -725,48 +733,46 @@ bs_getrange_i(Bitset *self, dssize_t start, dssize_t end) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF BitsetView *DCALL
-bs_getrange(Bitset *self, DeeObject *start, DeeObject *end) {
-	Dee_ssize_t start_i, end_i = self->bs_nbits;
-	if (DeeObject_AsSSize(start, &start_i))
+bs_getrange_index_n(Bitset *self, Dee_ssize_t start) {
+	DREF BitsetView *result;
+	result = DeeObject_MALLOC(BitsetView);
+	if unlikely(!result)
 		goto err;
-	if (!DeeNone_Check(end)) {
-		if (DeeObject_AsSSize(end, &end_i))
-			goto err;
-	}
-	return bs_getrange_i(self, start_i, end_i);
+	result->bsv_owner = (DREF DeeObject *)self;
+	Dee_Incref(self);
+	result->bsv_buf.bb_base = self->bs_bitset;
+	result->bsv_buf.bb_size = BITSET_SIZEOF(self->bs_nbits);
+#ifndef __INTELLISENSE__
+	result->bsv_buf.bb_put = NULL;
+#endif /* !__INTELLISENSE__ */
+	result->bsv_startbit = DeeSeqRange_Clamp_n(start, self->bs_nbits);
+	result->bsv_endbit   = self->bs_nbits;
+	result->bsv_bflags   = Dee_BUFFER_FWRITABLE;
+	DeeObject_Init(result, &BitsetView_Type);
+	return result;
 err:
 	return NULL;
 }
 
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-bs_delrange(Bitset *self, DeeObject *start, DeeObject *end) {
+bs_delrange_index(Bitset *self, Dee_ssize_t start, Dee_ssize_t end) {
 	struct Dee_seq_range range;
-	Dee_ssize_t start_i, end_i = self->bs_nbits;
-	if (DeeObject_AsSSize(start, &start_i))
-		goto err;
-	if (!DeeNone_Check(end)) {
-		if (DeeObject_AsSSize(end, &end_i))
-			goto err;
-	}
-	DeeSeqRange_Clamp(&range, start_i, end_i, self->bs_nbits);
+	DeeSeqRange_Clamp(&range, start, end, self->bs_nbits);
 	bitset_nclear(self->bs_bitset, range.sr_start, range.sr_end);
 	return 0;
-err:
-	return -1;
 }
 
-PRIVATE WUNUSED NONNULL((1, 2, 3, 4)) int DCALL
-bs_setrange(Bitset *self, DeeObject *start,
-            DeeObject *end, DeeObject *value) {
-	Dee_ssize_t start_i, end_i = self->bs_nbits;
+PRIVATE WUNUSED NONNULL((1)) int DCALL
+bs_delrange_index_n(Bitset *self, Dee_ssize_t start) {
+	size_t used_start = DeeSeqRange_Clamp_n(start, self->bs_nbits);
+	bitset_nclear(self->bs_bitset, used_start, self->bs_nbits);
+	return 0;
+}
+
+PRIVATE WUNUSED NONNULL((1, 4)) int DCALL
+bs_setrange_index(Bitset *self, Dee_ssize_t start, Dee_ssize_t end, DeeObject *value) {
 	struct Dee_seq_range range;
-	if (DeeObject_AsSSize(start, &start_i))
-		goto err;
-	if (!DeeNone_Check(end)) {
-		if (DeeObject_AsSSize(end, &end_i))
-			goto err;
-	}
-	DeeSeqRange_Clamp(&range, start_i, end_i, self->bs_nbits);
+	DeeSeqRange_Clamp(&range, start, end, self->bs_nbits);
 	if (DeeBool_Check(value)) {
 		if (DeeBool_IsTrue(value)) {
 			bitset_nset(self->bs_bitset, range.sr_start, range.sr_end);
@@ -800,6 +806,11 @@ bs_setrange(Bitset *self, DeeObject *start,
 	return -1;
 }
 
+PRIVATE WUNUSED NONNULL((1, 3)) int DCALL
+bs_setrange_index_n(Bitset *self, Dee_ssize_t start, DeeObject *value) {
+	return bs_setrange_index(self, start, SSIZE_MAX, value);
+}
+
 PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
 bs_getbuf(Bitset *__restrict self,
           DeeBuffer *__restrict info,
@@ -1516,11 +1527,11 @@ bs_bool(Bitset *__restrict self) {
 	return bitset_anyset(self->bs_bitset, self->bs_nbits) ? 1 : 0;
 }
 
-PRIVATE WUNUSED NONNULL((1)) dssize_t DCALL
+PRIVATE WUNUSED NONNULL((1)) Dee_ssize_t DCALL
 bs_printrepr(Bitset *__restrict self, dformatprinter printer, void *arg) {
 	bool is_first;
 	size_t bitno;
-	dssize_t temp, result;
+	Dee_ssize_t temp, result;
 	result = DeeFormat_PRINT(printer, arg, "Bitset({");
 	if unlikely(result < 0)
 		goto done;
@@ -1542,7 +1553,7 @@ bs_printrepr(Bitset *__restrict self, dformatprinter printer, void *arg) {
 
 PRIVATE WUNUSED NONNULL((1, 2)) Dee_ssize_t DCALL
 bs_foreach(Bitset *self, Dee_foreach_t proc, void *arg) {
-	dssize_t temp, result = 0;
+	Dee_ssize_t temp, result = 0;
 	size_t bitno;
 	bitset_foreach (bitno, self->bs_bitset, self->bs_nbits) {
 		DREF DeeObject *id;
@@ -1568,7 +1579,7 @@ PRIVATE struct type_nsi tpconst bs_nsi = {
 	/* .nsi_flags = */ TYPE_SEQX_FMUTABLE | TYPE_SEQX_FRESIZABLE,
 	{
 		/* .nsi_setlike = */ {
-			/* .nsi_getsize = */ (dfunptr_t)&bs_nsi_getsize,
+			/* .nsi_getsize = */ (dfunptr_t)&bs_size,
 			/* .nsi_insert  = */ (dfunptr_t)&bs_nsi_insert,
 			/* .nsi_remove  = */ (dfunptr_t)&bs_nsi_remove,
 		}
@@ -1621,17 +1632,48 @@ PRIVATE struct type_cmp bs_cmp = {
 };
 
 PRIVATE struct type_seq bs_seq = {
-	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&bs_iter,
-	/* .tp_sizeob   = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&bs_size,
-	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&bs_contains,
-	/* .tp_getitem  = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&bs_contains,
-	/* .tp_delitem  = */ (int (DCALL *)(DeeObject *, DeeObject *))&bs_delitem,
-	/* .tp_setitem  = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&bs_setitem,
-	/* .tp_getrange = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *, DeeObject *))&bs_getrange,
-	/* .tp_delrange = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&bs_delrange,
-	/* .tp_setrange = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *, DeeObject *))&bs_setrange,
-	/* .tp_nsi      = */ &bs_nsi,
-	/* .tp_foreach  = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&bs_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&bs_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&bs_contains,
+	/* .tp_getitem                    = */ NULL,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &bs_nsi,
+	/* .tp_foreach                    = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&bs_foreach,
+	/* .tp_foreach_pair               = */ NULL,
+	/* .tp_bounditem                  = */ NULL,
+	/* .tp_hasitem                    = */ NULL,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&bs_size,
+	/* .tp_size_fast                  = */ NULL,
+	/* .tp_getitem_index              = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&bs_getitem_index,
+	/* .tp_getitem_index_fast         = */ NULL,
+	/* .tp_delitem_index              = */ (int (DCALL *)(DeeObject *, size_t))&bs_delitem_index,
+	/* .tp_setitem_index              = */ (int (DCALL *)(DeeObject *, size_t, DeeObject *))&bs_setitem_index,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
+	/* .tp_getrange_index             = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))&bs_getrange_index,
+	/* .tp_delrange_index             = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))&bs_delrange_index,
+	/* .tp_setrange_index             = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t, DeeObject *))&bs_setrange_index,
+	/* .tp_getrange_index_n           = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t))&bs_getrange_index_n,
+	/* .tp_delrange_index_n           = */ (int (DCALL *)(DeeObject *, Dee_ssize_t))&bs_delrange_index_n,
+	/* .tp_setrange_index_n           = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, DeeObject *))&bs_setrange_index_n,
+	/* .tp_trygetitem                 = */ NULL,
+	/* .tp_trygetitem_index           = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&bs_trygetitem_index,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE struct type_buffer bs_buffer = {
@@ -1943,7 +1985,7 @@ INTERN DeeTypeObject Bitset_Type = {
 		/* .tp_repr      = */ NULL,
 		/* .tp_bool      = */ (int (DCALL *)(DeeObject *__restrict))&bs_bool,
 		/* .tp_print     = */ NULL,
-		/* .tp_printrepr = */ (dssize_t (DCALL *)(DeeObject *__restrict, Dee_formatprinter_t, void *))&bs_printrepr,
+		/* .tp_printrepr = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_formatprinter_t, void *))&bs_printrepr,
 	},
 	/* .tp_call          = */ NULL,
 	/* .tp_visit         = */ NULL,
@@ -1974,7 +2016,7 @@ INTERN DeeTypeObject Bitset_Type = {
 
 
 
-#define robs_nsi_getsize bs_nsi_getsize
+#define robs_nsi_getsize bs_size
 #define robs_hash        bs_hash
 
 PRIVATE WUNUSED NONNULL((1)) DREF Bitset *DCALL
@@ -2033,19 +2075,21 @@ robs_init_fromseq_or_bitset(DeeObject *seq) {
 #define robs_or  bs_or
 #define robs_xor bs_xor
 
-#define robs_eq       bs_eq
-#define robs_ne       bs_ne
-#define robs_le       bs_le
-#define robs_ge       bs_ge
-#define robs_gr       bs_gr
-#define robs_lo       bs_lo
-#define robs_iter     bs_iter
-#define robs_size     bs_size
-#define robs_contains bs_contains
-#define robs_foreach  bs_foreach
+#define robs_eq               bs_eq
+#define robs_ne               bs_ne
+#define robs_le               bs_le
+#define robs_ge               bs_ge
+#define robs_gr               bs_gr
+#define robs_lo               bs_lo
+#define robs_iter             bs_iter
+#define robs_size             bs_size
+#define robs_contains         bs_contains
+#define robs_foreach          bs_foreach
+#define robs_getitem_index    bs_getitem_index
+#define robs_trygetitem_index bs_trygetitem_index
 
 PRIVATE WUNUSED NONNULL((1)) DREF BitsetView *DCALL
-robs_getrange_i(Bitset *self, dssize_t start, dssize_t end) {
+robs_getrange_index(Bitset *self, Dee_ssize_t start, Dee_ssize_t end) {
 	struct Dee_seq_range range;
 	DREF BitsetView *result;
 	result = DeeObject_MALLOC(BitsetView);
@@ -2069,15 +2113,23 @@ robs_getrange_i(Bitset *self, dssize_t start, dssize_t end) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF BitsetView *DCALL
-robs_getrange(Bitset *self, DeeObject *start, DeeObject *end) {
-	Dee_ssize_t start_i, end_i = self->bs_nbits;
-	if (DeeObject_AsSSize(start, &start_i))
+robs_getrange_index_n(Bitset *self, Dee_ssize_t start) {
+	DREF BitsetView *result;
+	result = DeeObject_MALLOC(BitsetView);
+	if unlikely(!result)
 		goto err;
-	if (!DeeNone_Check(end)) {
-		if (DeeObject_AsSSize(end, &end_i))
-			goto err;
-	}
-	return robs_getrange_i(self, start_i, end_i);
+	result->bsv_owner = (DREF DeeObject *)self;
+	Dee_Incref(self);
+	result->bsv_buf.bb_base = self->bs_bitset;
+	result->bsv_buf.bb_size = BITSET_SIZEOF(self->bs_nbits);
+#ifndef __INTELLISENSE__
+	result->bsv_buf.bb_put = NULL;
+#endif /* !__INTELLISENSE__ */
+	result->bsv_startbit = DeeSeqRange_Clamp_n(start, self->bs_nbits);
+	result->bsv_endbit   = self->bs_nbits;
+	result->bsv_bflags   = Dee_BUFFER_FREADONLY;
+	DeeObject_Init(result, &BitsetView_Type);
+	return result;
 err:
 	return NULL;
 }
@@ -2133,11 +2185,11 @@ robs_init(size_t argc, DeeObject *const *argv) {
 
 #define robs_bool bs_bool
 
-PRIVATE WUNUSED NONNULL((1)) dssize_t DCALL
+PRIVATE WUNUSED NONNULL((1)) Dee_ssize_t DCALL
 robs_printrepr(Bitset *__restrict self, dformatprinter printer, void *arg) {
 	bool is_first;
 	size_t bitno;
-	dssize_t temp, result;
+	Dee_ssize_t temp, result;
 	result = DeeFormat_PRINT(printer, arg, "Bitset.Frozen({");
 	if unlikely(result < 0)
 		goto done;
@@ -2216,17 +2268,48 @@ PRIVATE struct type_cmp robs_cmp = {
 };
 
 PRIVATE struct type_seq robs_seq = {
-	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&robs_iter,
-	/* .tp_sizeob   = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&robs_size,
-	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&robs_contains,
-	/* .tp_getitem  = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&robs_contains,
-	/* .tp_delitem  = */ NULL,
-	/* .tp_setitem  = */ NULL,
-	/* .tp_getrange = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *, DeeObject *))&robs_getrange,
-	/* .tp_delrange = */ NULL,
-	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &robs_nsi,
-	/* .tp_foreach  = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&robs_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&robs_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&robs_contains,
+	/* .tp_getitem                    = */ NULL,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &robs_nsi,
+	/* .tp_foreach                    = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&robs_foreach,
+	/* .tp_foreach_pair               = */ NULL,
+	/* .tp_bounditem                  = */ NULL,
+	/* .tp_hasitem                    = */ NULL,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&robs_size,
+	/* .tp_size_fast                  = */ NULL,
+	/* .tp_getitem_index              = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&robs_getitem_index,
+	/* .tp_getitem_index_fast         = */ NULL,
+	/* .tp_delitem_index              = */ NULL,
+	/* .tp_setitem_index              = */ NULL,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
+	/* .tp_getrange_index             = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))&robs_getrange_index,
+	/* .tp_delrange_index             = */ NULL,
+	/* .tp_setrange_index             = */ NULL,
+	/* .tp_getrange_index_n           = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t))&robs_getrange_index_n,
+	/* .tp_delrange_index_n           = */ NULL,
+	/* .tp_setrange_index_n           = */ NULL,
+	/* .tp_trygetitem                 = */ NULL,
+	/* .tp_trygetitem_index           = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&robs_trygetitem_index,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE struct type_buffer robs_buffer = {
@@ -2434,7 +2517,7 @@ INTERN DeeTypeObject RoBitset_Type = {
 		/* .tp_repr      = */ NULL,
 		/* .tp_bool      = */ (int (DCALL *)(DeeObject *__restrict))&robs_bool,
 		/* .tp_print     = */ NULL,
-		/* .tp_printrepr = */ (dssize_t (DCALL *)(DeeObject *__restrict, Dee_formatprinter_t, void *))&robs_printrepr,
+		/* .tp_printrepr = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_formatprinter_t, void *))&robs_printrepr,
 	},
 	/* .tp_call          = */ NULL,
 	/* .tp_visit         = */ NULL,
@@ -2477,7 +2560,7 @@ bsv_err_readonly(BitsetView *__restrict self) {
 
 
 PRIVATE WUNUSED NONNULL((1)) size_t DCALL
-bsv_nsi_getsize(BitsetView *__restrict self) {
+bsv_size(BitsetView *__restrict self) {
 	return bitset_npopcount(BitsetView_GetBitset(self),
 	                        self->bsv_startbit,
 	                        self->bsv_endbit);
@@ -2678,11 +2761,6 @@ bsv_iter(BitsetView *__restrict self) {
 	return NULL;
 }
 
-PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-bsv_size(BitsetView *__restrict self) {
-	return DeeInt_NewSize(bsv_nsi_getsize(self));
-}
-
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
 bsv_contains(BitsetView *self, DeeObject *key) {
 	size_t bitno;
@@ -2695,11 +2773,27 @@ bsv_contains(BitsetView *self, DeeObject *key) {
 	return NULL;
 }
 
+PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
+bsv_getitem_index(BitsetView *self, size_t bitno) {
+	if unlikely(bitno >= BitsetView_GetNBits(self))
+		goto err_too_large;
+	return_bool(bitset_test(BitsetView_GetBitset(self),
+	                        bitno + self->bsv_startbit));
+err_too_large:
+	bsv_err_bad_index(self, bitno);
+	return NULL;
+}
+
+PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
+bsv_trygetitem_index(BitsetView *self, size_t bitno) {
+	if unlikely(bitno >= BitsetView_GetNBits(self))
+		return ITER_DONE;
+	return_bool(bitset_test(BitsetView_GetBitset(self),
+	                        bitno + self->bsv_startbit));
+}
+
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-bsv_delitem(BitsetView *self, DeeObject *key) {
-	size_t bitno;
-	if (DeeObject_AsSize(key, &bitno))
-		goto err;
+bsv_delitem_index(BitsetView *self, size_t bitno) {
 	if unlikely(bitno >= BitsetView_GetNBits(self))
 		goto err_too_large;
 	if unlikely(!BitsetView_IsWritable(self))
@@ -2710,16 +2804,11 @@ bsv_delitem(BitsetView *self, DeeObject *key) {
 	return bsv_err_readonly(self);
 err_too_large:
 	return bsv_err_bad_index(self, bitno);
-err:
-	return -1;
 }
 
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-bsv_setitem(BitsetView *self, DeeObject *key, DeeObject *value) {
+bsv_setitem_index(BitsetView *self, size_t bitno, DeeObject *value) {
 	int temp;
-	size_t bitno;
-	if (DeeObject_AsSize(key, &bitno))
-		goto err;
 	if unlikely(bitno >= BitsetView_GetNBits(self))
 		goto err_too_large;
 	if unlikely(!BitsetView_IsWritable(self))
@@ -2742,7 +2831,7 @@ bsv_setitem(BitsetView *self, DeeObject *key, DeeObject *value) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF BitsetView *DCALL
-bsv_getrange_i(BitsetView *self, dssize_t start, dssize_t end) {
+bsv_getrange_index(BitsetView *self, Dee_ssize_t start, Dee_ssize_t end) {
 	struct Dee_seq_range range;
 	DREF BitsetView *result;
 	result = DeeObject_MALLOC(BitsetView);
@@ -2768,56 +2857,64 @@ bsv_getrange_i(BitsetView *self, dssize_t start, dssize_t end) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF BitsetView *DCALL
-bsv_getrange(BitsetView *self, DeeObject *start, DeeObject *end) {
-	Dee_ssize_t start_i, end_i = BitsetView_GetNBits(self);
-	if (DeeObject_AsSSize(start, &start_i))
+bsv_getrange_index_n(BitsetView *self, Dee_ssize_t start) {
+	DREF BitsetView *result;
+	result = DeeObject_MALLOC(BitsetView);
+	if unlikely(!result)
 		goto err;
-	if (!DeeNone_Check(end)) {
-		if (DeeObject_AsSSize(end, &end_i))
-			goto err;
-	}
-	return bsv_getrange_i(self, start_i, end_i);
+	result->bsv_owner = (DREF DeeObject *)self;
+	result->bsv_buf.bb_base = self->bsv_buf.bb_base;
+	result->bsv_buf.bb_size = self->bsv_buf.bb_size;
+#ifndef __INTELLISENSE__
+	result->bsv_buf.bb_put = self->bsv_buf.bb_put;
+	if (!result->bsv_buf.bb_put)
+		result->bsv_owner = self->bsv_owner;
+#endif /* !__INTELLISENSE__ */
+	Dee_Incref(result->bsv_owner);
+	result->bsv_startbit = DeeSeqRange_Clamp_n(start, BitsetView_GetNBits(self)) + self->bsv_startbit;
+	result->bsv_endbit   = self->bsv_endbit;
+	result->bsv_bflags   = self->bsv_bflags;
+	DeeObject_Init(result, &BitsetView_Type);
+	return result;
 err:
 	return NULL;
 }
 
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-bsv_delrange(BitsetView *self, DeeObject *start, DeeObject *end) {
+bsv_delrange_index(BitsetView *self, Dee_ssize_t start, Dee_ssize_t end) {
 	struct Dee_seq_range range;
-	Dee_ssize_t start_i, end_i = BitsetView_GetNBits(self);
-	if (DeeObject_AsSSize(start, &start_i))
-		goto err;
-	if (!DeeNone_Check(end)) {
-		if (DeeObject_AsSSize(end, &end_i))
-			goto err;
-	}
 	if unlikely(!BitsetView_IsWritable(self))
 		goto err_readonly;
-	DeeSeqRange_Clamp(&range, start_i, end_i, BitsetView_GetNBits(self));
+	DeeSeqRange_Clamp(&range, start, end, BitsetView_GetNBits(self));
 	bitset_nclear(BitsetView_GetBitset(self),
 	              self->bsv_startbit + range.sr_start,
 	              self->bsv_startbit + range.sr_end);
 	return 0;
 err_readonly:
 	return bsv_err_readonly(self);
-err:
-	return -1;
 }
 
-PRIVATE WUNUSED NONNULL((1, 2, 3, 4)) int DCALL
-bsv_setrange(BitsetView *self, DeeObject *start,
-             DeeObject *end, DeeObject *value) {
-	Dee_ssize_t start_i, end_i = BitsetView_GetNBits(self);
+PRIVATE WUNUSED NONNULL((1)) int DCALL
+bsv_delrange_index_n(BitsetView *self, Dee_ssize_t start) {
+	size_t used_start;
+	if unlikely(!BitsetView_IsWritable(self))
+		goto err_readonly;
+	used_start = DeeSeqRange_Clamp_n(start, BitsetView_GetNBits(self));
+	bitset_nclear(BitsetView_GetBitset(self),
+	              self->bsv_startbit + used_start,
+	              self->bsv_endbit);
+	return 0;
+err_readonly:
+	return bsv_err_readonly(self);
+}
+
+PRIVATE WUNUSED NONNULL((1, 4)) int DCALL
+bsv_setrange_index(BitsetView *self, Dee_ssize_t start,
+                   Dee_ssize_t end, DeeObject *value) {
 	struct Dee_seq_range range;
-	if (DeeObject_AsSSize(start, &start_i))
-		goto err;
-	if (!DeeNone_Check(end)) {
-		if (DeeObject_AsSSize(end, &end_i))
-			goto err;
-	}
 	if unlikely(!BitsetView_IsWritable(self))
 		goto err_readonly;
-	DeeSeqRange_Clamp(&range, start_i, end_i, BitsetView_GetNBits(self));
+	DeeSeqRange_Clamp(&range, start, end, BitsetView_GetNBits(self));
 	if (DeeBool_Check(value)) {
 		if (DeeBool_IsTrue(value)) {
 			bitset_nset(BitsetView_GetBitset(self),
@@ -2859,6 +2956,11 @@ bsv_setrange(BitsetView *self, DeeObject *start,
 	return -1;
 }
 
+PRIVATE WUNUSED NONNULL((1, 3)) int DCALL
+bsv_setrange_index_n(BitsetView *self, Dee_ssize_t start, DeeObject *value) {
+	return bsv_setrange_index(self, start, SSIZE_MAX, value);
+}
+
 PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
 bsv_getbuf(BitsetView *__restrict self,
            DeeBuffer *__restrict info,
@@ -3429,22 +3531,22 @@ bsv_init(BitsetView *__restrict self, size_t argc, DeeObject *const *argv) {
 				goto err_invalid_mode;
 			}
 			if (argc >= 3) {
-				if (DeeObject_AsSSize(argv[2], (dssize_t *)&start))
+				if (DeeObject_AsSSize(argv[2], (Dee_ssize_t *)&start))
 					goto err;
 				if (argc >= 4) {
 					if unlikely(argc > 4)
 						goto err_args;
-					if (DeeObject_AsSSize(argv[3], (dssize_t *)&end))
+					if (DeeObject_AsSSize(argv[3], (Dee_ssize_t *)&end))
 						goto err;
 				}
 			}
 		} else {
-			if (DeeObject_AsSSize(argv[1], (dssize_t *)&start))
+			if (DeeObject_AsSSize(argv[1], (Dee_ssize_t *)&start))
 				goto err;
 			if (argc >= 3) {
 				if unlikely(argc > 3)
 					goto err_args;
-				if (DeeObject_AsSSize(argv[2], (dssize_t *)&end))
+				if (DeeObject_AsSSize(argv[2], (Dee_ssize_t *)&end))
 					goto err;
 			}
 		}
@@ -3747,9 +3849,9 @@ bsv_bool(BitsetView *self) {
 	return bitset_nanyset(BitsetView_GetBitset(self), self->bsv_startbit, self->bsv_endbit) ? 1 : 0;
 }
 
-PRIVATE WUNUSED NONNULL((1)) dssize_t DCALL
+PRIVATE WUNUSED NONNULL((1)) Dee_ssize_t DCALL
 bsv_printrepr(BitsetView *__restrict self, dformatprinter printer, void *arg) {
-	dssize_t temp, result;
+	Dee_ssize_t temp, result;
 	DeeObject *owner = self->bsv_owner;
 	result = DeeFormat_Printf(printer, arg, "BitsetView(%r", owner);
 	if unlikely(result < 0)
@@ -3776,7 +3878,7 @@ bsv_printrepr(BitsetView *__restrict self, dformatprinter printer, void *arg) {
 
 PRIVATE WUNUSED NONNULL((1, 2)) Dee_ssize_t DCALL
 bsv_foreach(BitsetView *self, Dee_foreach_t proc, void *arg) {
-	dssize_t temp, result = 0;
+	Dee_ssize_t temp, result = 0;
 	size_t bitno;
 	bitset_nforeach (bitno, BitsetView_GetBitset(self),
 	                 self->bsv_startbit, self->bsv_endbit) {
@@ -3802,7 +3904,7 @@ PRIVATE struct type_nsi tpconst bsv_nsi = {
 	/* .nsi_flags = */ TYPE_SEQX_FMUTABLE | TYPE_SEQX_FRESIZABLE,
 	{
 		/* .nsi_setlike = */ {
-			/* .nsi_getsize = */ (dfunptr_t)&bsv_nsi_getsize,
+			/* .nsi_getsize = */ (dfunptr_t)&bsv_size,
 			/* .nsi_insert  = */ (dfunptr_t)&bsv_nsi_insert,
 			/* .nsi_remove  = */ (dfunptr_t)&bsv_nsi_remove,
 		}
@@ -3855,17 +3957,48 @@ PRIVATE struct type_cmp bsv_cmp = {
 };
 
 PRIVATE struct type_seq bsv_seq = {
-	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&bsv_iter,
-	/* .tp_sizeob   = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&bsv_size,
-	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&bsv_contains,
-	/* .tp_getitem  = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&bsv_contains,
-	/* .tp_delitem  = */ (int (DCALL *)(DeeObject *, DeeObject *))&bsv_delitem,
-	/* .tp_setitem  = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&bsv_setitem,
-	/* .tp_getrange = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *, DeeObject *))&bsv_getrange,
-	/* .tp_delrange = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&bsv_delrange,
-	/* .tp_setrange = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *, DeeObject *))&bsv_setrange,
-	/* .tp_nsi      = */ &bsv_nsi,
-	/* .tp_foreach  = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&bsv_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&bsv_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&bsv_contains,
+	/* .tp_getitem                    = */ NULL,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &bsv_nsi,
+	/* .tp_foreach                    = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&bsv_foreach,
+	/* .tp_foreach_pair               = */ NULL,
+	/* .tp_bounditem                  = */ NULL,
+	/* .tp_hasitem                    = */ NULL,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&bsv_size,
+	/* .tp_size_fast                  = */ NULL,
+	/* .tp_getitem_index              = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&bsv_getitem_index,
+	/* .tp_getitem_index_fast         = */ NULL,
+	/* .tp_delitem_index              = */ (int (DCALL *)(DeeObject *, size_t))&bsv_delitem_index,
+	/* .tp_setitem_index              = */ (int (DCALL *)(DeeObject *, size_t, DeeObject *))&bsv_setitem_index,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
+	/* .tp_getrange_index             = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))&bsv_getrange_index,
+	/* .tp_delrange_index             = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))&bsv_delrange_index,
+	/* .tp_setrange_index             = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t, DeeObject *))&bsv_setrange_index,
+	/* .tp_getrange_index_n           = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t))&bsv_getrange_index_n,
+	/* .tp_delrange_index_n           = */ (int (DCALL *)(DeeObject *, Dee_ssize_t))&bsv_delrange_index_n,
+	/* .tp_setrange_index_n           = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, DeeObject *))&bsv_setrange_index_n,
+	/* .tp_trygetitem                 = */ NULL,
+	/* .tp_trygetitem_index           = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&bsv_trygetitem_index,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE struct type_buffer bsv_buffer = {
@@ -4181,7 +4314,7 @@ INTERN DeeTypeObject BitsetView_Type = {
 		/* .tp_repr      = */ NULL,
 		/* .tp_bool      = */ (int (DCALL *)(DeeObject *__restrict))&bsv_bool,
 		/* .tp_print     = */ NULL,
-		/* .tp_printrepr = */ (dssize_t (DCALL *)(DeeObject *__restrict, Dee_formatprinter_t, void *))&bsv_printrepr,
+		/* .tp_printrepr = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_formatprinter_t, void *))&bsv_printrepr,
 	},
 	/* .tp_call          = */ NULL,
 	/* .tp_visit         = */ (void (DCALL *)(DeeObject *__restrict, dvisit_t, void *))&bsv_visit,
diff --git a/src/dex/collections/deque.c b/src/dex/collections/deque.c
index 1ca872efb..852404f22 100644
--- a/src/dex/collections/deque.c
+++ b/src/dex/collections/deque.c
@@ -42,8 +42,7 @@ DECL_BEGIN
 
 
 INTERN WUNUSED NONNULL((1, 2)) bool DCALL
-Deque_PushFront_unlocked(Deque *__restrict self,
-                         DeeObject *__restrict item) {
+Deque_PushFront_unlocked(Deque *self, DeeObject *item) {
 	DequeBucket *new_bucket;
 	ASSERT(self->d_head_idx < self->d_bucket_sz);
 	ASSERT(self->d_head_use <= self->d_bucket_sz);
@@ -91,8 +90,7 @@ Deque_PushFront_unlocked(Deque *__restrict self,
 }
 
 INTERN WUNUSED NONNULL((1, 2)) bool DCALL
-Deque_PushBack_unlocked(Deque *__restrict self,
-                        DeeObject *__restrict item) {
+Deque_PushBack_unlocked(Deque *self, DeeObject *item) {
 	DequeBucket *new_bucket;
 	ASSERT(self->d_head_idx < self->d_bucket_sz);
 	ASSERT(self->d_head_use <= self->d_bucket_sz);
@@ -274,9 +272,9 @@ Deque_lrrot_unlocked(Deque *__restrict self, size_t num_objects) {
 	temp = DequeIterator_ITEM(&iter);
 	while (num_objects--) {
 		DequeIterator_Next(&iter, self);
-		next                      = DequeIterator_ITEM(&iter);
+		next = DequeIterator_ITEM(&iter);
 		DequeIterator_ITEM(&iter) = temp;
-		temp                      = next;
+		temp = next;
 	}
 	DEQUE_HEAD(self) = temp;
 	++self->d_version;
@@ -435,10 +433,8 @@ Deque_PopBack(Deque *__restrict self) {
 }
 
 /* Insert/delete items at a given index. */
-INTERN int DCALL
-Deque_Insert(Deque *__restrict self,
-             size_t index,
-             DeeObject *__restrict item) {
+INTERN WUNUSED NONNULL((1, 3)) int DCALL
+Deque_Insert(Deque *self, size_t index, DeeObject *item) {
 again:
 	Deque_LockWrite(self);
 	if (index > self->d_size)
@@ -470,7 +466,7 @@ Deque_Erase(Deque *__restrict self,
 	result = self->d_size - (size_t)index;
 	if (result > num_items)
 		result = num_items;
-	pop_objv = (DREF DeeObject **)Dee_TryMalloca(result * sizeof(DREF DeeObject *));
+	pop_objv = (DREF DeeObject **)Dee_TryMallocac(result, sizeof(DREF DeeObject *));
 	if unlikely(!pop_objv) {
 		Deque_LockEndWrite(self);
 		if (Dee_CollectMemory(result * sizeof(DREF DeeObject *)))
@@ -490,7 +486,7 @@ Deque_Erase(Deque *__restrict self,
 	/* Drop references to popped objects. */
 	Dee_Decrefv(pop_objv, result);
 	Dee_Freea(pop_objv);
-	return (dssize_t)result;
+	return (Dee_ssize_t)result;
 }
 
 
@@ -513,7 +509,7 @@ Deque_Pop(Deque *__restrict self, size_t index) {
 }
 
 INTERN WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-Deque_Pops(Deque *__restrict self, dssize_t index) {
+Deque_Pops(Deque *__restrict self, Dee_ssize_t index) {
 	DREF DeeObject *result;
 	Deque_LockWrite(self);
 	if unlikely(index < 0)
@@ -779,16 +775,15 @@ deq_fini(Deque *__restrict self) {
 
 
 #if __SIZEOF_INT__ != __SIZEOF_SIZE_T__
-PRIVATE dssize_t DCALL
+PRIVATE NONNULL((1, 2)) Dee_ssize_t DCALL
 deque_push_back(void *self, DeeObject *__restrict ob) {
-	return (dssize_t)Deque_PushBack((Deque *)self, ob);
+	return (Dee_ssize_t)Deque_PushBack((Deque *)self, ob);
 }
 #endif /* __SIZEOF_INT__ != __SIZEOF_SIZE_T__ */
 
 
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-deq_init(Deque *__restrict self,
-         size_t argc, DeeObject *const *argv) {
+deq_init(Deque *__restrict self, size_t argc, DeeObject *const *argv) {
 	DeeObject *init   = Dee_EmptySeq;
 	self->d_bucket_sz = DEQUE_BUCKET_DEFAULT_SIZE;
 	if (DeeArg_Unpack(argc, argv, "|o" UNPuSIZ ":Deque", &init, &self->d_bucket_sz))
@@ -833,8 +828,7 @@ deq_init(Deque *__restrict self,
 
 
 PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
-deq_assign(Deque *__restrict self,
-           DeeObject *__restrict seq) {
+deq_assign(Deque *self, DeeObject *seq) {
 	Deque bTemp, bOld;
 	weakref_support_init(&bTemp);
 	if (DeeObject_InstanceOfExact(seq, &Deque_Type)) {
@@ -898,7 +892,8 @@ deq_moveassign(Deque *__restrict self,
 	return 0;
 }
 
-PRIVATE WUNUSED NONNULL((1)) int DCALL deq_bool(Deque *__restrict self) {
+PRIVATE WUNUSED NONNULL((1)) int DCALL
+deq_bool(Deque *__restrict self) {
 	return atomic_read(&self->d_size) != 0;
 }
 
@@ -935,7 +930,7 @@ deq_clear(Deque *__restrict self) {
 	deq_fini(&bData);
 }
 
-PRIVATE void DCALL
+PRIVATE NONNULL((1)) void DCALL
 deq_pclear(Deque *__restrict self, unsigned int gc_priority) {
 	Deque_LockWrite(self);
 	if (self->d_size) {
@@ -993,11 +988,6 @@ deq_iter(Deque *__restrict self) {
 	return result;
 }
 
-PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-deq_size(Deque *__restrict self) {
-	return DeeInt_NewSize(atomic_read(&self->d_size));
-}
-
 PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
 deq_contains(Deque *self, DeeObject *item) {
 	Deque_LockRead(self);
@@ -1033,12 +1023,14 @@ deq_contains(Deque *self, DeeObject *item) {
 	return NULL;
 }
 
-PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
-deq_get(Deque *self, DeeObject *index_ob) {
-	size_t index;
+PRIVATE WUNUSED NONNULL((1)) size_t DCALL
+deq_size(Deque *__restrict self) {
+	return atomic_read(&self->d_size);
+}
+
+PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
+deq_getitem_index(Deque *__restrict self, size_t index) {
 	DREF DeeObject *result;
-	if (DeeObject_AsSize(index_ob, &index))
-		goto err;
 	Deque_LockRead(self);
 	if (index >= self->d_size) {
 		size_t deq_size = self->d_size;
@@ -1055,74 +1047,36 @@ deq_get(Deque *self, DeeObject *index_ob) {
 	return NULL;
 }
 
-PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
-deq_del(Deque *__restrict self, DeeObject *__restrict index_ob) {
-	size_t index;
+PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
+deq_trygetitem_index(Deque *__restrict self, size_t index) {
 	DREF DeeObject *result;
-	if (DeeObject_AsSize(index_ob, &index))
-		goto err;
-	result = Deque_Pop(self, index);
-	if unlikely(!result)
-		goto err;
-	Dee_Decref(result);
-	return 0;
-err:
-	return -1;
-}
-
-PRIVATE WUNUSED NONNULL((1, 2, 3)) int DCALL
-deq_set(Deque *__restrict self,
-        DeeObject *__restrict index_ob,
-        DeeObject *__restrict value) {
-	size_t index;
-	DREF DeeObject *oldval;
-	if (DeeObject_AsSize(index_ob, &index))
-		goto err;
 	Deque_LockRead(self);
-	if (index >= self->d_size) {
-		size_t deq_size = self->d_size;
-		COMPILER_READ_BARRIER();
+	if unlikely(index >= self->d_size) {
 		Deque_LockEndRead(self);
-		err_index_out_of_bounds((DeeObject *)self, index, deq_size);
-		goto err;
+		return ITER_DONE;
 	}
-	/* Exchange the stored item. */
-	Dee_Incref(value);
-	oldval                  = DEQUE_ITEM(self, index);
-	DEQUE_ITEM(self, index) = value;
+	result = DEQUE_ITEM(self, index);
+	Dee_Incref(result);
 	Deque_LockEndRead(self);
-	Dee_Decref(oldval);
-	return 0;
-err:
-	return -1;
-}
-
-PRIVATE WUNUSED NONNULL((1)) size_t DCALL
-deq_nsi_size(Deque *__restrict self) {
-	return atomic_read(&self->d_size);
+	return result;
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-deq_nsi_getitem(Deque *__restrict self, size_t index) {
+deq_getitem_index_fast(Deque *__restrict self, size_t index) {
 	DREF DeeObject *result;
 	Deque_LockRead(self);
-	if (index >= self->d_size) {
-		size_t deq_size = self->d_size;
-		COMPILER_READ_BARRIER();
+	if unlikely(index >= self->d_size) {
 		Deque_LockEndRead(self);
-		err_index_out_of_bounds((DeeObject *)self, index, deq_size);
-		goto err;
+		return NULL; /* >> The sequence is resizable and `index >= CURRENT_SIZE' */
 	}
 	result = DEQUE_ITEM(self, index);
 	Dee_Incref(result);
 	Deque_LockEndRead(self);
 	return result;
-err:
-	return NULL;
 }
 
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-deq_nsi_delitem(Deque *__restrict self, size_t index) {
+deq_delitem_index(Deque *__restrict self, size_t index) {
 	DREF DeeObject *result;
 	result = Deque_Pop(self, index);
 	if unlikely(!result)
@@ -1133,10 +1087,8 @@ deq_nsi_delitem(Deque *__restrict self, size_t index) {
 	return -1;
 }
 
-PRIVATE int DCALL
-deq_nsi_setitem(Deque *__restrict self,
-                size_t index,
-                DeeObject *__restrict value) {
+PRIVATE WUNUSED NONNULL((1, 3)) int DCALL
+deq_setitem_index(Deque *self, size_t index, DeeObject *value) {
 	DREF DeeObject *oldval;
 	Deque_LockRead(self);
 	if (index >= self->d_size) {
@@ -1157,10 +1109,8 @@ deq_nsi_setitem(Deque *__restrict self,
 	return -1;
 }
 
-PRIVATE WUNUSED DREF DeeObject *DCALL
-deq_nsi_xchitem(Deque *__restrict self,
-                size_t index,
-                DeeObject *__restrict value) {
+PRIVATE WUNUSED NONNULL((1, 3)) DREF DeeObject *DCALL
+deq_nsi_xchitem(Deque *self, size_t index, DeeObject *value) {
 	DREF DeeObject *oldval;
 	Deque_LockRead(self);
 	if (index >= self->d_size) {
@@ -1208,11 +1158,11 @@ PRIVATE struct type_nsi tpconst deq_nsi = {
 	/* .nsi_flags   = */ TYPE_SEQX_FMUTABLE | TYPE_SEQX_FRESIZABLE,
 	{
 		/* .nsi_seqlike = */ {
-			/* .nsi_getsize      = */ (dfunptr_t)&deq_nsi_size,
-			/* .nsi_getsize_fast = */ (dfunptr_t)&deq_nsi_size,
-			/* .nsi_getitem      = */ (dfunptr_t)&deq_nsi_getitem,
-			/* .nsi_delitem      = */ (dfunptr_t)&deq_nsi_delitem,
-			/* .nsi_setitem      = */ (dfunptr_t)&deq_nsi_setitem,
+			/* .nsi_getsize      = */ (dfunptr_t)&deq_size,
+			/* .nsi_getsize_fast = */ (dfunptr_t)&deq_size,
+			/* .nsi_getitem      = */ (dfunptr_t)&deq_getitem_index,
+			/* .nsi_delitem      = */ (dfunptr_t)&deq_delitem_index,
+			/* .nsi_setitem      = */ (dfunptr_t)&deq_setitem_index,
 			/* .nsi_getitem_fast = */ (dfunptr_t)NULL,
 			/* .nsi_getrange     = */ (dfunptr_t)NULL,
 			/* .nsi_getrange_n   = */ (dfunptr_t)NULL,
@@ -1237,20 +1187,51 @@ PRIVATE struct type_nsi tpconst deq_nsi = {
 };
 
 PRIVATE struct type_seq deq_seq = {
-	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&deq_iter,
-	/* .tp_sizeob   = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&deq_size,
-	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&deq_contains,
-	/* .tp_getitem  = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&deq_get,
-	/* .tp_delitem  = */ (int (DCALL *)(DeeObject *, DeeObject *))&deq_del,
-	/* .tp_setitem  = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&deq_set,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&deq_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&deq_contains,
+	/* .tp_getitem                    = */ NULL,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &deq_nsi,
+	/* .tp_foreach                    = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&deq_foreach,
+	/* .tp_foreach_pair               = */ NULL,
+	/* .tp_bounditem                  = */ NULL,
+	/* .tp_hasitem                    = */ NULL,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&deq_size,
+	/* .tp_size_fast                  = */ (size_t (DCALL *)(DeeObject *__restrict))&deq_size,
+	/* .tp_getitem_index              = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&deq_getitem_index,
+	/* .tp_getitem_index_fast         = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&deq_getitem_index_fast,
+	/* .tp_delitem_index              = */ (int (DCALL *)(DeeObject *, size_t))&deq_delitem_index,
+	/* .tp_setitem_index              = */ (int (DCALL *)(DeeObject *, size_t, DeeObject *))&deq_setitem_index,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
 	/* XXX: range operators? (Also: Add a fallback delrange / setrange in `sequence' that calls
 	 *                              forward to member functions `insert(index:?Dint, ob)',
 	 *                             `erase(index:?Dint, count:?Dint = 1)') */
-	/* .tp_getrange = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *, DeeObject *))NULL,
-	/* .tp_delrange = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))NULL,
-	/* .tp_setrange = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *, DeeObject *))NULL,
-	/* .tp_nsi      = */ &deq_nsi,
-	/* .tp_foreach  = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&deq_foreach,
+	/* .tp_getrange_index             = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))NULL,
+	/* .tp_delrange_index             = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))NULL,
+	/* .tp_setrange_index             = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t, DeeObject *))NULL,
+	/* .tp_getrange_index_n           = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t))NULL,
+	/* .tp_delrange_index_n           = */ (int (DCALL *)(DeeObject *, Dee_ssize_t))NULL,
+	/* .tp_setrange_index_n           = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, DeeObject *))NULL,
+	/* .tp_trygetitem                 = */ NULL,
+	/* .tp_trygetitem_index           = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&deq_trygetitem_index,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
@@ -1395,7 +1376,7 @@ deq_sizeof(Deque *self) {
 	Deque_LockRead(self);
 	ASSERT((self->d_head != NULL) == (self->d_tail != NULL));
 	if (self->d_head) {
-		size_t count      = 1;
+		size_t count = 1;
 		DequeBucket *iter = self->d_head;
 		for (; iter != self->d_tail; iter = iter->db_next)
 			++count;
@@ -1759,8 +1740,7 @@ deqiter_getindex_ob(DequeIteratorObject *__restrict self) {
 }
 
 PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
-deqiter_setindex_ob(DequeIteratorObject *__restrict self,
-                    DeeObject *__restrict value) {
+deqiter_setindex_ob(DequeIteratorObject *self, DeeObject *value) {
 	size_t newindex = (size_t)-1;
 	if (!DeeNone_Check(value) &&
 	    DeeObject_AsSize(value, &newindex))
diff --git a/src/dex/collections/fixedlist.c b/src/dex/collections/fixedlist.c
index fca614b5a..59ab2af4f 100644
--- a/src/dex/collections/fixedlist.c
+++ b/src/dex/collections/fixedlist.c
@@ -471,17 +471,12 @@ PRIVATE struct type_gc tpconst fl_gc = {
 
 
 PRIVATE WUNUSED NONNULL((1)) size_t DCALL
-fl_nsi_size(FixedList *__restrict self) {
-	return self->fl_size;
-}
-
-PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
 fl_size(FixedList *__restrict self) {
-	return DeeInt_NewSize(self->fl_size);
+	return self->fl_size;
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-fl_nsi_getitem(FixedList *__restrict self, size_t index) {
+fl_getitem_index(FixedList *__restrict self, size_t index) {
 	DREF DeeObject *result;
 	if unlikely(index >= self->fl_size) {
 		err_index_out_of_bounds((DeeObject *)self, index, self->fl_size);
@@ -502,7 +497,7 @@ fl_nsi_getitem(FixedList *__restrict self, size_t index) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-fl_nsi_getitem_fast(FixedList *__restrict self, size_t index) {
+fl_getitem_index_fast(FixedList *__restrict self, size_t index) {
 	DREF DeeObject *result;
 	ASSERT(index < self->fl_size);
 	FixedList_LockRead(self);
@@ -512,8 +507,48 @@ fl_nsi_getitem_fast(FixedList *__restrict self, size_t index) {
 	return result;
 }
 
+PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
+fl_trygetitem_index(FixedList *__restrict self, size_t index) {
+	DREF DeeObject *result;
+	if unlikely(index >= self->fl_size)
+		goto nope;
+	FixedList_LockRead(self);
+	result = self->fl_elem[index];
+	if unlikely(!result) {
+		FixedList_LockEndRead(self);
+		goto nope;
+	}
+	Dee_Incref(result);
+	FixedList_LockEndRead(self);
+	return result;
+nope:
+	return ITER_DONE;
+}
+
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-fl_nsi_delitem(FixedList *__restrict self, size_t index) {
+fl_bounditem_index(FixedList *__restrict self, size_t index) {
+	DREF DeeObject *result;
+	if unlikely(index >= self->fl_size)
+		return -2;
+	FixedList_LockRead(self);
+	result = self->fl_elem[index];
+	if unlikely(!result) {
+		FixedList_LockEndRead(self);
+		return 0;
+	}
+	Dee_Incref(result);
+	FixedList_LockEndRead(self);
+	return 1;
+}
+
+PRIVATE WUNUSED NONNULL((1)) int DCALL
+fl_hasitem_index(FixedList *__restrict self, size_t index) {
+	return index < self->fl_size ? 1 : 0;
+}
+
+
+PRIVATE WUNUSED NONNULL((1)) int DCALL
+fl_delitem_index(FixedList *__restrict self, size_t index) {
 	DREF DeeObject *oldval;
 	if unlikely(index >= self->fl_size) {
 		err_index_out_of_bounds((DeeObject *)self, index, self->fl_size);
@@ -529,9 +564,8 @@ fl_nsi_delitem(FixedList *__restrict self, size_t index) {
 	return -1;
 }
 
-PRIVATE int DCALL
-fl_nsi_setitem(FixedList *__restrict self, size_t index,
-               DeeObject *__restrict value) {
+PRIVATE WUNUSED NONNULL((1, 3)) int DCALL
+fl_setitem_index(FixedList *self, size_t index, DeeObject *value) {
 	DREF DeeObject *oldval;
 	if unlikely(index >= self->fl_size) {
 		err_index_out_of_bounds((DeeObject *)self, index, self->fl_size);
@@ -548,9 +582,8 @@ fl_nsi_setitem(FixedList *__restrict self, size_t index,
 	return -1;
 }
 
-PRIVATE WUNUSED DREF DeeObject *DCALL
-fl_nsi_xchitem(FixedList *__restrict self, size_t index,
-               DeeObject *__restrict value) {
+PRIVATE WUNUSED NONNULL((1, 3)) DREF DeeObject *DCALL
+fl_nsi_xchitem(FixedList *self, size_t index, DeeObject *value) {
 	DREF DeeObject *result;
 	if unlikely(index >= self->fl_size) {
 		err_index_out_of_bounds((DeeObject *)self, index, self->fl_size);
@@ -572,42 +605,7 @@ fl_nsi_xchitem(FixedList *__restrict self, size_t index,
 }
 
 PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
-fl_getitem(FixedList *self,
-           DeeObject *index_ob) {
-	size_t index;
-	if (DeeObject_AsSize(index_ob, &index))
-		goto err;
-	return fl_nsi_getitem(self, index);
-err:
-	return NULL;
-}
-
-PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
-fl_delitem(FixedList *__restrict self,
-           DeeObject *__restrict index_ob) {
-	size_t index;
-	if (DeeObject_AsSize(index_ob, &index))
-		goto err;
-	return fl_nsi_delitem(self, index);
-err:
-	return -1;
-}
-
-PRIVATE WUNUSED NONNULL((1, 2, 3)) int DCALL
-fl_setitem(FixedList *__restrict self,
-           DeeObject *__restrict index_ob,
-           DeeObject *__restrict value) {
-	size_t index;
-	if (DeeObject_AsSize(index_ob, &index))
-		goto err;
-	return fl_nsi_setitem(self, index, value);
-err:
-	return -1;
-}
-
-PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
-fl_contains(FixedList *self,
-            DeeObject *value) {
+fl_contains(FixedList *self, DeeObject *value) {
 	size_t i;
 	for (i = 0; i < self->fl_size; ++i) {
 		DREF DeeObject *elem;
@@ -644,7 +642,7 @@ fl_iter(FixedList *__restrict self) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-fl_nsi_getrange(FixedList *__restrict self, dssize_t i_begin, dssize_t i_end) {
+fl_getrange_index(FixedList *__restrict self, Dee_ssize_t i_begin, Dee_ssize_t i_end) {
 	DREF FixedList *result;
 	struct Dee_seq_range range;
 	size_t range_size;
@@ -671,9 +669,9 @@ fl_nsi_getrange(FixedList *__restrict self, dssize_t i_begin, dssize_t i_end) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-fl_nsi_getrange_n(FixedList *__restrict self, dssize_t i_begin) {
+fl_getrange_index_n(FixedList *__restrict self, Dee_ssize_t i_begin) {
 #ifdef __OPTIMIZE_SIZE__
-	return fl_nsi_getrange(self, i_begin, SSIZE_MAX);
+	return fl_getrange_index(self, i_begin, SSIZE_MAX);
 #else /* __OPTIMIZE_SIZE__ */
 	DREF FixedList *result;
 	size_t start, range_size;
@@ -701,7 +699,7 @@ fl_nsi_getrange_n(FixedList *__restrict self, dssize_t i_begin) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-fl_nsi_delrange(FixedList *__restrict self, dssize_t i_begin, dssize_t i_end) {
+fl_delrange_index(FixedList *__restrict self, Dee_ssize_t i_begin, Dee_ssize_t i_end) {
 	struct Dee_seq_range range;
 	size_t range_size;
 	DeeSeqRange_Clamp(&range, i_begin, i_end, self->fl_size);
@@ -730,9 +728,9 @@ fl_nsi_delrange(FixedList *__restrict self, dssize_t i_begin, dssize_t i_end) {
 }
 
 PRIVATE WUNUSED NONNULL((1)) int DCALL
-fl_nsi_delrange_n(FixedList *__restrict self, dssize_t i_begin) {
+fl_delrange_index_n(FixedList *__restrict self, Dee_ssize_t i_begin) {
 #ifdef __OPTIMIZE_SIZE__
-	return fl_nsi_delrange(self, i_begin, SSIZE_MAX);
+	return fl_delrange_index(self, i_begin, SSIZE_MAX);
 #else /* __OPTIMIZE_SIZE__ */
 	size_t start, range_size;
 	start = DeeSeqRange_Clamp_n(i_begin, self->fl_size);
@@ -762,8 +760,8 @@ fl_nsi_delrange_n(FixedList *__restrict self, dssize_t i_begin) {
 }
 
 PRIVATE WUNUSED NONNULL((1, 4)) int DCALL
-fl_nsi_setrange(FixedList *self, dssize_t i_begin,
-                dssize_t i_end, DeeObject *values) {
+fl_setrange_index(FixedList *self, Dee_ssize_t i_begin,
+                  Dee_ssize_t i_end, DeeObject *values) {
 	struct Dee_seq_range range;
 	size_t i, range_size;
 	DREF DeeObject **values_buf;
@@ -794,9 +792,9 @@ fl_nsi_setrange(FixedList *self, dssize_t i_begin,
 }
 
 PRIVATE WUNUSED NONNULL((1, 3)) int DCALL
-fl_nsi_setrange_n(FixedList *self, dssize_t i_begin, DeeObject *values) {
+fl_setrange_index_n(FixedList *self, Dee_ssize_t i_begin, DeeObject *values) {
 #ifdef __OPTIMIZE_SIZE__
-	return fl_nsi_setrange(self, i_begin, SSIZE_MAX, values);
+	return fl_setrange_index(self, i_begin, SSIZE_MAX, values);
 #else /* __OPTIMIZE_SIZE__ */
 	size_t i, start, range_size;
 	DREF DeeObject **values_buf;
@@ -827,50 +825,6 @@ fl_nsi_setrange_n(FixedList *self, dssize_t i_begin, DeeObject *values) {
 #endif /* !__OPTIMIZE_SIZE__ */
 }
 
-
-PRIVATE WUNUSED NONNULL((1, 2, 3)) DREF DeeObject *DCALL
-fl_getrange(FixedList *self, DeeObject *begin, DeeObject *end) {
-	dssize_t i_begin, i_end;
-	if (DeeObject_AsSSize(begin, &i_begin))
-		goto err;
-	if (DeeNone_Check(end))
-		return fl_nsi_getrange_n(self, i_begin);
-	if (DeeObject_AsSSize(end, &i_end))
-		goto err;
-	return fl_nsi_getrange(self, i_begin, i_end);
-err:
-	return NULL;
-}
-
-PRIVATE WUNUSED NONNULL((1, 2, 3)) int DCALL
-fl_delrange(FixedList *self, DeeObject *begin, DeeObject *end) {
-	dssize_t i_begin, i_end;
-	if (DeeObject_AsSSize(begin, &i_begin))
-		goto err;
-	if (DeeNone_Check(end))
-		return fl_nsi_delrange_n(self, i_begin);
-	if (DeeObject_AsSSize(end, &i_end))
-		goto err;
-	return fl_nsi_delrange(self, i_begin, i_end);
-err:
-	return -1;
-}
-
-PRIVATE WUNUSED NONNULL((1, 2, 3, 4)) int DCALL
-fl_setrange(FixedList *self, DeeObject *begin,
-            DeeObject *end, DeeObject *values) {
-	dssize_t i_begin, i_end;
-	if (DeeObject_AsSSize(begin, &i_begin))
-		goto err;
-	if (DeeNone_Check(end))
-		return fl_nsi_setrange_n(self, i_begin, values);
-	if (DeeObject_AsSSize(end, &i_end))
-		goto err;
-	return fl_nsi_setrange(self, i_begin, i_end, values);
-err:
-	return -1;
-}
-
 PRIVATE WUNUSED NONNULL((1, 4)) size_t DCALL
 fl_nsi_find(FixedList *self, size_t start, size_t end,
             DeeObject *keyed_search_item, DeeObject *key) {
@@ -927,7 +881,7 @@ fl_nsi_rfind(FixedList *self, size_t start, size_t end,
 }
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-fl_nsi_pop(FixedList *__restrict self, dssize_t index) {
+fl_nsi_pop(FixedList *__restrict self, Dee_ssize_t index) {
 	DREF DeeObject *result;
 	if (index < 0)
 		index += self->fl_size;
@@ -1143,18 +1097,18 @@ PRIVATE struct type_nsi tpconst fl_nsi = {
 	/* .nsi_flags   = */ TYPE_SEQX_FMUTABLE,
 	{
 		/* .nsi_seqlike = */ {
-			/* .nsi_getsize      = */ (dfunptr_t)&fl_nsi_size,
-			/* .nsi_getsize_fast = */ (dfunptr_t)&fl_nsi_size,
-			/* .nsi_getitem      = */ (dfunptr_t)&fl_nsi_getitem,
-			/* .nsi_delitem      = */ (dfunptr_t)&fl_nsi_delitem,
-			/* .nsi_setitem      = */ (dfunptr_t)&fl_nsi_setitem,
-			/* .nsi_getitem_fast = */ (dfunptr_t)&fl_nsi_getitem_fast,
-			/* .nsi_getrange     = */ (dfunptr_t)&fl_nsi_getrange,
-			/* .nsi_getrange_n   = */ (dfunptr_t)&fl_nsi_getrange_n,
-			/* .nsi_delrange     = */ (dfunptr_t)&fl_nsi_delrange,
-			/* .nsi_delrange_n   = */ (dfunptr_t)&fl_nsi_delrange_n,
-			/* .nsi_setrange     = */ (dfunptr_t)&fl_nsi_setrange,
-			/* .nsi_setrange_n   = */ (dfunptr_t)&fl_nsi_setrange_n,
+			/* .nsi_getsize      = */ (dfunptr_t)&fl_size,
+			/* .nsi_getsize_fast = */ (dfunptr_t)&fl_size,
+			/* .nsi_getitem      = */ (dfunptr_t)&fl_getitem_index,
+			/* .nsi_delitem      = */ (dfunptr_t)&fl_delitem_index,
+			/* .nsi_setitem      = */ (dfunptr_t)&fl_setitem_index,
+			/* .nsi_getitem_fast = */ (dfunptr_t)&fl_getitem_index_fast,
+			/* .nsi_getrange     = */ (dfunptr_t)&fl_getrange_index,
+			/* .nsi_getrange_n   = */ (dfunptr_t)&fl_getrange_index_n,
+			/* .nsi_delrange     = */ (dfunptr_t)&fl_delrange_index,
+			/* .nsi_delrange_n   = */ (dfunptr_t)&fl_delrange_index_n,
+			/* .nsi_setrange     = */ (dfunptr_t)&fl_setrange_index,
+			/* .nsi_setrange_n   = */ (dfunptr_t)&fl_setrange_index_n,
 			/* .nsi_find         = */ (dfunptr_t)&fl_nsi_find,
 			/* .nsi_rfind        = */ (dfunptr_t)&fl_nsi_rfind,
 			/* .nsi_xch          = */ (dfunptr_t)&fl_nsi_xchitem,
@@ -1172,17 +1126,48 @@ PRIVATE struct type_nsi tpconst fl_nsi = {
 };
 
 PRIVATE struct type_seq fl_seq = {
-	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&fl_iter,
-	/* .tp_sizeob   = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&fl_size,
-	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&fl_contains,
-	/* .tp_getitem  = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&fl_getitem,
-	/* .tp_delitem  = */ (int (DCALL *)(DeeObject *, DeeObject *))&fl_delitem,
-	/* .tp_setitem  = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&fl_setitem,
-	/* .tp_getrange = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *, DeeObject *))&fl_getrange,
-	/* .tp_delrange = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&fl_delrange,
-	/* .tp_setrange = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *, DeeObject *))&fl_setrange,
-	/* .tp_nsi      = */ &fl_nsi,
-	/* .tp_foreach  = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&fl_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&fl_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&fl_contains,
+	/* .tp_getitem                    = */ NULL,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &fl_nsi,
+	/* .tp_foreach                    = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&fl_foreach,
+	/* .tp_foreach_pair               = */ NULL,
+	/* .tp_bounditem                  = */ NULL,
+	/* .tp_hasitem                    = */ NULL,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&fl_size,
+	/* .tp_size_fast                  = */ (size_t (DCALL *)(DeeObject *__restrict))&fl_size,
+	/* .tp_getitem_index              = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&fl_getitem_index,
+	/* .tp_getitem_index_fast         = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&fl_getitem_index_fast,
+	/* .tp_delitem_index              = */ (int (DCALL *)(DeeObject *, size_t))&fl_delitem_index,
+	/* .tp_setitem_index              = */ (int (DCALL *)(DeeObject *, size_t, DeeObject *))&fl_setitem_index,
+	/* .tp_bounditem_index            = */ (int (DCALL *)(DeeObject *, size_t))&fl_bounditem_index,
+	/* .tp_hasitem_index              = */ (int (DCALL *)(DeeObject *, size_t))&fl_hasitem_index,
+	/* .tp_getrange_index             = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))&fl_getrange_index,
+	/* .tp_delrange_index             = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t))&fl_delrange_index,
+	/* .tp_setrange_index             = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, Dee_ssize_t, DeeObject *))&fl_setrange_index,
+	/* .tp_getrange_index_n           = */ (DREF DeeObject *(DCALL *)(DeeObject *, Dee_ssize_t))&fl_getrange_index_n,
+	/* .tp_delrange_index_n           = */ (int (DCALL *)(DeeObject *, Dee_ssize_t))&fl_delrange_index_n,
+	/* .tp_setrange_index_n           = */ (int (DCALL *)(DeeObject *, Dee_ssize_t, DeeObject *))&fl_setrange_index_n,
+	/* .tp_trygetitem                 = */ NULL,
+	/* .tp_trygetitem_index           = */ (DREF DeeObject *(DCALL *)(DeeObject *, size_t))&fl_trygetitem_index,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
diff --git a/src/dex/collections/rangemap.c b/src/dex/collections/rangemap.c
index 839a3102e..cac960670 100644
--- a/src/dex/collections/rangemap.c
+++ b/src/dex/collections/rangemap.c
@@ -650,7 +650,8 @@ PRIVATE struct type_seq rangemap_seq = {
 	/* .tp_getrange = */ NULL,
 	/* .tp_delrange = */ NULL,
 	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &rangemap_nsi
+	/* .tp_nsi      = */ &rangemap_nsi,
+	/* TODO: New operators */
 };
 
 PRIVATE struct type_method tpconst rangemap_methods[] = {
@@ -1282,7 +1283,8 @@ PRIVATE struct type_seq proxy_keys_seq = {
 	/* .tp_getrange = */ NULL,
 	/* .tp_delrange = */ NULL,
 	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &proxy_keys_nsi
+	/* .tp_nsi      = */ &proxy_keys_nsi,
+	/* TODO: New operators */
 };
 
 PRIVATE struct type_seq proxy_values_seq = {
@@ -1295,7 +1297,8 @@ PRIVATE struct type_seq proxy_values_seq = {
 	/* .tp_getrange = */ NULL,
 	/* .tp_delrange = */ NULL,
 	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &proxy_nsi
+	/* .tp_nsi      = */ &proxy_nsi,
+	/* TODO: New operators */
 };
 
 PRIVATE struct type_seq proxy_items_seq = {
@@ -1308,7 +1311,8 @@ PRIVATE struct type_seq proxy_items_seq = {
 	/* .tp_getrange = */ NULL,
 	/* .tp_delrange = */ NULL,
 	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &proxy_nsi
+	/* .tp_nsi      = */ &proxy_nsi,
+	/* TODO: New operators */
 };
 
 PRIVATE struct type_seq proxy_nodes_seq = {
@@ -1321,7 +1325,8 @@ PRIVATE struct type_seq proxy_nodes_seq = {
 	/* .tp_getrange = */ NULL,
 	/* .tp_delrange = */ NULL,
 	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &proxy_nsi
+	/* .tp_nsi      = */ &proxy_nsi,
+	/* TODO: New operators */
 };
 
 PRIVATE struct type_seq proxy_ranges_seq = {
@@ -1334,7 +1339,8 @@ PRIVATE struct type_seq proxy_ranges_seq = {
 	/* .tp_getrange = */ NULL,
 	/* .tp_delrange = */ NULL,
 	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &proxy_nsi
+	/* .tp_nsi      = */ &proxy_nsi,
+	/* TODO: New operators */
 };
 
 PRIVATE struct type_seq proxy_mapitems_seq = {
@@ -1347,7 +1353,8 @@ PRIVATE struct type_seq proxy_mapitems_seq = {
 	/* .tp_getrange = */ NULL,
 	/* .tp_delrange = */ NULL,
 	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &proxy_mapitems_nsi
+	/* .tp_nsi      = */ &proxy_mapitems_nsi,
+	/* TODO: New operators */
 };
 
 PRIVATE struct type_seq proxy_asmap_seq = {
@@ -1361,6 +1368,7 @@ PRIVATE struct type_seq proxy_asmap_seq = {
 	/* .tp_delrange = */ NULL,
 	/* .tp_setrange = */ NULL,
 	/* .tp_nsi      = */ &proxy_asmap_nsi,
+	/* TODO: New operators */
 };
 
 PRIVATE WUNUSED NONNULL((1)) DREF RangeMapProxy *DCALL
diff --git a/src/dex/collections/rbtree.c b/src/dex/collections/rbtree.c
index 95a288606..134943e17 100644
--- a/src/dex/collections/rbtree.c
+++ b/src/dex/collections/rbtree.c
@@ -3537,6 +3537,7 @@ PRIVATE struct type_seq rbtree_seq = {
 	/* .tp_nsi          = */ &rbtree_nsi,
 	/* .tp_foreach      = */ NULL,
 	/* .tp_foreach_pair = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_pair_t, void *))&rbtree_foreach,
+	/* TODO: New operators */
 };
 
 PRIVATE struct type_gc tpconst rbtree_gc = {
diff --git a/src/dex/collections/udict.c b/src/dex/collections/udict.c
index 20650da56..e4aa1bbf0 100644
--- a/src/dex/collections/udict.c
+++ b/src/dex/collections/udict.c
@@ -729,6 +729,47 @@ udict_contains(UDict *self, DeeObject *key) {
 }
 
 
+PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
+udict_bounditem(UDict *self, DeeObject *key) {
+	dhash_t i, perturb;
+	dhash_t hash = UHASH(key);
+	UDict_LockRead(self);
+	perturb = i = hash & self->ud_mask;
+	for (;; UDict_HashNx(i, perturb)) {
+		struct udict_item *item;
+		item = &self->ud_elem[i & self->ud_mask];
+		if (USAME(item->di_key, key)) {
+			UDict_LockEndRead(self);
+			return 1; /* Found the item. */
+		}
+		if (!item->di_key)
+			break;
+	}
+	UDict_LockEndRead(self);
+	return -2;
+}
+
+PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
+udict_hasitem(UDict *self, DeeObject *key) {
+	dhash_t i, perturb;
+	dhash_t hash = UHASH(key);
+	UDict_LockRead(self);
+	perturb = i = hash & self->ud_mask;
+	for (;; UDict_HashNx(i, perturb)) {
+		struct udict_item *item;
+		item = &self->ud_elem[i & self->ud_mask];
+		if (USAME(item->di_key, key)) {
+			UDict_LockEndRead(self);
+			return 1; /* Found the item. */
+		}
+		if (!item->di_key)
+			break;
+	}
+	UDict_LockEndRead(self);
+	return 0;
+}
+
+
 PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
 udict_getitem(UDict *self, DeeObject *key) {
 	dhash_t i, perturb;
@@ -754,6 +795,31 @@ udict_getitem(UDict *self, DeeObject *key) {
 	return NULL;
 }
 
+PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
+udict_trygetitem(UDict *self, DeeObject *key) {
+	dhash_t i, perturb;
+	dhash_t hash = UHASH(key);
+	UDict_LockRead(self);
+	perturb = i = hash & self->ud_mask;
+	for (;; UDict_HashNx(i, perturb)) {
+		struct udict_item *item;
+		item = &self->ud_elem[i & self->ud_mask];
+		if (USAME(item->di_key, key)) {
+			/* Found the item. */
+			DREF DeeObject *result;
+			result = item->di_value;
+			Dee_Incref(result);
+			UDict_LockEndRead(self);
+			return result;
+		}
+		if (!item->di_key)
+			break;
+	}
+	UDict_LockEndRead(self);
+	return ITER_DONE;
+}
+
+
 PRIVATE WUNUSED NONNULL((1, 2, 3)) DREF DeeObject *DCALL
 UDict_GetItemDef(UDict *self, DeeObject *key, DeeObject *def) {
 	dhash_t i, perturb;
@@ -969,7 +1035,7 @@ udict_setitem_ex(UDict *self,
 
 
 PRIVATE WUNUSED NONNULL((1)) size_t DCALL
-udict_nsi_getsize(UDict *__restrict self) {
+udict_size(UDict *__restrict self) {
 	return atomic_read(&self->ud_used);
 }
 
@@ -1005,11 +1071,6 @@ udict_nsi_insertnew(UDict *self, DeeObject *key,
 	return -1;
 }
 
-PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-udict_size(UDict *__restrict self) {
-	return DeeInt_NewSize(atomic_read(&self->ud_used));
-}
-
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
 udict_iter(UDict *__restrict self) {
 	DREF UDictIterator *result;
@@ -1424,7 +1485,7 @@ PRIVATE struct type_nsi tpconst udict_nsi = {
 	/* .nsi_flags   = */ TYPE_SEQX_FMUTABLE | TYPE_SEQX_FRESIZABLE,
 	{
 		/* .nsi_maplike = */ {
-			/* .nsi_getsize    = */ (dfunptr_t)&udict_nsi_getsize,
+			/* .nsi_getsize    = */ (dfunptr_t)&udict_size,
 			/* .nsi_nextkey    = */ (dfunptr_t)&udictiterator_nextkey,
 			/* .nsi_nextvalue  = */ (dfunptr_t)&udictiterator_nextvalue,
 			/* .nsi_getdefault = */ (dfunptr_t)&UDict_GetItemDef,
@@ -1436,18 +1497,48 @@ PRIVATE struct type_nsi tpconst udict_nsi = {
 };
 
 PRIVATE struct type_seq udict_seq = {
-	/* .tp_iter         = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&udict_iter,
-	/* .tp_sizeob       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&udict_size,
-	/* .tp_contains     = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&udict_contains,
-	/* .tp_getitem      = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&udict_getitem,
-	/* .tp_delitem      = */ (int (DCALL *)(DeeObject *, DeeObject *))&udict_delitem,
-	/* .tp_setitem      = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&udict_setitem,
-	/* .tp_getrange     = */ NULL,
-	/* .tp_delrange     = */ NULL,
-	/* .tp_setrange     = */ NULL,
-	/* .tp_nsi          = */ &udict_nsi,
-	/* .tp_foreach      = */ NULL,
-	/* .tp_foreach_pair = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_pair_t, void *))&udict_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&udict_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&udict_contains,
+	/* .tp_getitem                    = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&udict_getitem,
+	/* .tp_delitem                    = */ (int (DCALL *)(DeeObject *, DeeObject *))&udict_delitem,
+	/* .tp_setitem                    = */ (int (DCALL *)(DeeObject *, DeeObject *, DeeObject *))&udict_setitem,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &udict_nsi,
+	/* .tp_foreach                    = */ NULL,
+	/* .tp_foreach_pair               = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_pair_t, void *))&udict_foreach,
+	/* .tp_bounditem                  = */ (int (DCALL *)(DeeObject *, DeeObject *))&udict_bounditem,
+	/* .tp_hasitem                    = */ (int (DCALL *)(DeeObject *, DeeObject *))&udict_hasitem,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&udict_size,
+	/* .tp_size_fast                  = */ (size_t (DCALL *)(DeeObject *__restrict))&udict_size,
+	/* .tp_getitem_index              = */ NULL,
+	/* .tp_getitem_index_fast         = */ NULL,
+	/* .tp_delitem_index              = */ NULL,
+	/* .tp_setitem_index              = */ NULL,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
+	/* .tp_getrange_index             = */ NULL,
+	/* .tp_delrange_index             = */ NULL,
+	/* .tp_setrange_index             = */ NULL,
+	/* .tp_getrange_index_n           = */ NULL,
+	/* .tp_delrange_index_n           = */ NULL,
+	/* .tp_setrange_index_n           = */ NULL,
+	/* .tp_trygetitem                 = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&udict_trygetitem,
+	/* .tp_trygetitem_index           = */ NULL,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 
@@ -1970,7 +2061,7 @@ urodict_printrepr(URoDict *__restrict self,
 }
 
 PRIVATE WUNUSED NONNULL((1)) size_t DCALL
-urodict_nsi_getsize(URoDict *__restrict self) {
+urodict_size(URoDict *__restrict self) {
 	ASSERT(self->urd_size != (size_t)-2);
 	return self->urd_size;
 }
@@ -2009,11 +2100,6 @@ urodict_iter(URoDict *__restrict self) {
 	return result;
 }
 
-PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-urodict_size(URoDict *__restrict self) {
-	return DeeInt_NewSize(self->urd_size);
-}
-
 PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
 urodict_contains(URoDict *self, DeeObject *key) {
 	size_t i, perturb, hash;
@@ -2047,6 +2133,54 @@ urodict_getitem(URoDict *self, DeeObject *key) {
 	return NULL;
 }
 
+PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
+urodict_bounditem(URoDict *self, DeeObject *key) {
+	size_t i, perturb, hash;
+	struct udict_item *item;
+	hash    = UHASH(key);
+	perturb = i = hash & self->urd_mask;
+	for (;; URoDict_HashNx(i, perturb)) {
+		item = &self->urd_elem[i & self->urd_mask];
+		if (!item->di_key)
+			break;
+		if (USAME(item->di_key, key))
+			return 1; /* Found it! */
+	}
+	return -2;
+}
+
+PRIVATE WUNUSED NONNULL((1, 2)) int DCALL
+urodict_hasitem(URoDict *self, DeeObject *key) {
+	size_t i, perturb, hash;
+	struct udict_item *item;
+	hash    = UHASH(key);
+	perturb = i = hash & self->urd_mask;
+	for (;; URoDict_HashNx(i, perturb)) {
+		item = &self->urd_elem[i & self->urd_mask];
+		if (!item->di_key)
+			break;
+		if (USAME(item->di_key, key))
+			return 1; /* Found it! */
+	}
+	return 0;
+}
+
+PRIVATE WUNUSED NONNULL((1, 2)) DREF DeeObject *DCALL
+urodict_trygetitem(URoDict *self, DeeObject *key) {
+	size_t i, perturb, hash;
+	struct udict_item *item;
+	hash    = UHASH(key);
+	perturb = i = hash & self->urd_mask;
+	for (;; URoDict_HashNx(i, perturb)) {
+		item = &self->urd_elem[i & self->urd_mask];
+		if (!item->di_key)
+			break;
+		if (USAME(item->di_key, key))
+			return_reference_(item->di_value); /* Found it! */
+	}
+	return ITER_DONE;
+}
+
 PRIVATE WUNUSED NONNULL((1, 2)) Dee_ssize_t DCALL
 urodict_foreach(URoDict *self, Dee_foreach_pair_t proc, void *arg) {
 	Dee_ssize_t temp, result = 0;
@@ -2071,7 +2205,7 @@ PRIVATE struct type_nsi tpconst urodict_nsi = {
 	/* .nsi_flags   = */ TYPE_SEQX_FNORMAL,
 	{
 		/* .nsi_maplike = */ {
-			/* .nsi_getsize    = */ (dfunptr_t)&urodict_nsi_getsize,
+			/* .nsi_getsize    = */ (dfunptr_t)&urodict_size,
 			/* .nsi_nextkey    = */ (dfunptr_t)&urodictiterator_nextkey,
 			/* .nsi_nextvalue  = */ (dfunptr_t)&urodictiterator_nextvalue,
 			/* .nsi_getdefault = */ (dfunptr_t)&URoDict_GetItemDef
@@ -2081,18 +2215,48 @@ PRIVATE struct type_nsi tpconst urodict_nsi = {
 
 
 PRIVATE struct type_seq urodict_seq = {
-	/* .tp_iter         = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&urodict_iter,
-	/* .tp_sizeob       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&urodict_size,
-	/* .tp_contains     = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&urodict_contains,
-	/* .tp_getitem      = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&urodict_getitem,
-	/* .tp_delitem      = */ NULL,
-	/* .tp_setitem      = */ NULL,
-	/* .tp_getrange     = */ NULL,
-	/* .tp_delrange     = */ NULL,
-	/* .tp_setrange     = */ NULL,
-	/* .tp_nsi          = */ &urodict_nsi,
-	/* .tp_foreach      = */ NULL,
-	/* .tp_foreach_pair = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_pair_t, void *))&urodict_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&urodict_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&urodict_contains,
+	/* .tp_getitem                    = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&urodict_getitem,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &urodict_nsi,
+	/* .tp_foreach                    = */ NULL,
+	/* .tp_foreach_pair               = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_pair_t, void *))&urodict_foreach,
+	/* .tp_bounditem                  = */ (int (DCALL *)(DeeObject *, DeeObject *))&urodict_bounditem,
+	/* .tp_hasitem                    = */ (int (DCALL *)(DeeObject *, DeeObject *))&urodict_hasitem,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&urodict_size,
+	/* .tp_size_fast                  = */ (size_t (DCALL *)(DeeObject *__restrict))&urodict_size,
+	/* .tp_getitem_index              = */ NULL,
+	/* .tp_getitem_index_fast         = */ NULL,
+	/* .tp_delitem_index              = */ NULL,
+	/* .tp_setitem_index              = */ NULL,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
+	/* .tp_getrange_index             = */ NULL,
+	/* .tp_delrange_index             = */ NULL,
+	/* .tp_setrange_index             = */ NULL,
+	/* .tp_getrange_index_n           = */ NULL,
+	/* .tp_delrange_index_n           = */ NULL,
+	/* .tp_setrange_index_n           = */ NULL,
+	/* .tp_trygetitem                 = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&urodict_trygetitem,
+	/* .tp_trygetitem_index           = */ NULL,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
diff --git a/src/dex/collections/uset.c b/src/dex/collections/uset.c
index f29c4717c..5c74d8466 100644
--- a/src/dex/collections/uset.c
+++ b/src/dex/collections/uset.c
@@ -963,13 +963,8 @@ uset_iter(USet *__restrict self) {
 }
 
 
-PRIVATE WUNUSED NONNULL((1)) DREF DeeObject *DCALL
-uset_size(USet *__restrict self) {
-	return DeeInt_NewSize(atomic_read(&self->us_used));
-}
-
 PRIVATE WUNUSED NONNULL((1)) size_t DCALL
-uset_nsi_getsize(USet *__restrict self) {
+uset_size(USet *__restrict self) {
 	return atomic_read(&self->us_used);
 }
 
@@ -1240,7 +1235,7 @@ PRIVATE struct type_nsi tpconst uset_nsi = {
 	/* .nsi_flags   = */ TYPE_SEQX_FMUTABLE | TYPE_SEQX_FRESIZABLE,
 	{
 		/* .nsi_setlike = */ {
-			/* .nsi_getsize    = */ (dfunptr_t)&uset_nsi_getsize,
+			/* .nsi_getsize    = */ (dfunptr_t)&uset_size,
 			/* .nsi_insert     = */ (dfunptr_t)&USet_Insert,
 			/* .nsi_remove     = */ (dfunptr_t)&USet_Remove,
 		}
@@ -1248,17 +1243,48 @@ PRIVATE struct type_nsi tpconst uset_nsi = {
 };
 
 PRIVATE struct type_seq uset_seq = {
-	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&uset_iter,
-	/* .tp_sizeob   = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&uset_size,
-	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&uset_contains,
-	/* .tp_getitem  = */ NULL,
-	/* .tp_delitem  = */ NULL,
-	/* .tp_setitem  = */ NULL,
-	/* .tp_getrange = */ NULL,
-	/* .tp_delrange = */ NULL,
-	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &uset_nsi,
-	/* .tp_foreach  = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&uset_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&uset_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&uset_contains,
+	/* .tp_getitem                    = */ NULL,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &uset_nsi,
+	/* .tp_foreach                    = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&uset_foreach,
+	/* .tp_foreach_pair               = */ NULL,
+	/* .tp_bounditem                  = */ NULL,
+	/* .tp_hasitem                    = */ NULL,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&uset_size,
+	/* .tp_size_fast                  = */ (size_t (DCALL *)(DeeObject *__restrict))&uset_size,
+	/* .tp_getitem_index              = */ NULL,
+	/* .tp_getitem_index_fast         = */ NULL,
+	/* .tp_delitem_index              = */ NULL,
+	/* .tp_setitem_index              = */ NULL,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
+	/* .tp_getrange_index             = */ NULL,
+	/* .tp_delrange_index             = */ NULL,
+	/* .tp_setrange_index             = */ NULL,
+	/* .tp_getrange_index_n           = */ NULL,
+	/* .tp_delrange_index_n           = */ NULL,
+	/* .tp_setrange_index_n           = */ NULL,
+	/* .tp_trygetitem                 = */ NULL,
+	/* .tp_trygetitem_index           = */ NULL,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE struct type_method tpconst uset_methods[] = {
@@ -1518,9 +1544,8 @@ INTERN DeeTypeObject URoSetIterator_Type = {
 
 
 STATIC_ASSERT(offsetof(URoSet, urs_size) == offsetof(USet, us_used));
-#define uroset_size        uset_size
-#define uroset_bool        uset_bool
-#define uroset_nsi_getsize uset_nsi_getsize
+#define uroset_size uset_size
+#define uroset_bool uset_bool
 
 
 PRIVATE WUNUSED NONNULL((1, 2)) dssize_t DCALL
@@ -1553,7 +1578,7 @@ PRIVATE struct type_nsi tpconst uroset_nsi = {
 	/* .nsi_flags   = */ TYPE_SEQX_FNORMAL,
 	{
 		/* .nsi_setlike = */ {
-			/* .nsi_getsize = */ (dfunptr_t)&uroset_nsi_getsize,
+			/* .nsi_getsize = */ (dfunptr_t)&uroset_size,
 		}
 	}
 };
@@ -1615,17 +1640,48 @@ uroset_foreach(URoSet *self, Dee_foreach_t proc, void *arg) {
 }
 
 PRIVATE struct type_seq uroset_seq = {
-	/* .tp_iter     = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&uroset_iter,
-	/* .tp_sizeob   = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&uroset_size,
-	/* .tp_contains = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&uroset_contains,
-	/* .tp_getitem  = */ NULL,
-	/* .tp_delitem  = */ NULL,
-	/* .tp_setitem  = */ NULL,
-	/* .tp_getrange = */ NULL,
-	/* .tp_delrange = */ NULL,
-	/* .tp_setrange = */ NULL,
-	/* .tp_nsi      = */ &uroset_nsi,
-	/* .tp_foreach  = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&uroset_foreach,
+	/* .tp_iter                       = */ (DREF DeeObject *(DCALL *)(DeeObject *__restrict))&uroset_iter,
+	/* .tp_sizeob                     = */ NULL,
+	/* .tp_contains                   = */ (DREF DeeObject *(DCALL *)(DeeObject *, DeeObject *))&uroset_contains,
+	/* .tp_getitem                    = */ NULL,
+	/* .tp_delitem                    = */ NULL,
+	/* .tp_setitem                    = */ NULL,
+	/* .tp_getrange                   = */ NULL,
+	/* .tp_delrange                   = */ NULL,
+	/* .tp_setrange                   = */ NULL,
+	/* .tp_nsi                        = */ &uroset_nsi,
+	/* .tp_foreach                    = */ (Dee_ssize_t (DCALL *)(DeeObject *__restrict, Dee_foreach_t, void *))&uroset_foreach,
+	/* .tp_foreach_pair               = */ NULL,
+	/* .tp_bounditem                  = */ NULL,
+	/* .tp_hasitem                    = */ NULL,
+	/* .tp_size                       = */ (size_t (DCALL *)(DeeObject *__restrict))&uroset_size,
+	/* .tp_size_fast                  = */ (size_t (DCALL *)(DeeObject *__restrict))&uroset_size,
+	/* .tp_getitem_index              = */ NULL,
+	/* .tp_getitem_index_fast         = */ NULL,
+	/* .tp_delitem_index              = */ NULL,
+	/* .tp_setitem_index              = */ NULL,
+	/* .tp_bounditem_index            = */ NULL,
+	/* .tp_hasitem_index              = */ NULL,
+	/* .tp_getrange_index             = */ NULL,
+	/* .tp_delrange_index             = */ NULL,
+	/* .tp_setrange_index             = */ NULL,
+	/* .tp_getrange_index_n           = */ NULL,
+	/* .tp_delrange_index_n           = */ NULL,
+	/* .tp_setrange_index_n           = */ NULL,
+	/* .tp_trygetitem                 = */ NULL,
+	/* .tp_trygetitem_index           = */ NULL,
+	/* .tp_trygetitem_string_hash     = */ NULL,
+	/* .tp_getitem_string_hash        = */ NULL,
+	/* .tp_delitem_string_hash        = */ NULL,
+	/* .tp_setitem_string_hash        = */ NULL,
+	/* .tp_bounditem_string_hash      = */ NULL,
+	/* .tp_hasitem_string_hash        = */ NULL,
+	/* .tp_trygetitem_string_len_hash = */ NULL,
+	/* .tp_getitem_string_len_hash    = */ NULL,
+	/* .tp_delitem_string_len_hash    = */ NULL,
+	/* .tp_setitem_string_len_hash    = */ NULL,
+	/* .tp_bounditem_string_len_hash  = */ NULL,
+	/* .tp_hasitem_string_len_hash    = */ NULL,
 };
 
 PRIVATE NONNULL((1, 2)) void DCALL