many fix and more assert #17

Job	Run time
check no-default-features	15s
check std	21s
clippy	1m 6s
check serde	18s
docs	1m 12s
fmt	7s
test stable --no-default-features	58s
test stable	48s
test no_std	20s
test stable --features="all, scroll"	1m 20s
test stable --features="all, optimism"	49s
test beta --no-default-features	52s
test beta	45s
test beta --features="all, scroll"	1m 26s
test beta --features="all, optimism"	53s
test nightly --no-default-features	46s
test nightly	45s
test nightly --features="all, scroll"	1m 24s
test nightly --features="all, optimism"	51s
	15m 16s

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