feat: branch node decoding #46

Job	Run time
clippy	16s
feature-checks	18s
miri --no-default-features	33s
test stable --no-default-features	22s
miri	47s
test stable	34s
docs	21s
miri --all-features	51s
test stable --all-features	34s
test beta --no-default-features	20s
fmt	15s
test beta	17s
test beta --all-features	32s
test nightly --no-default-features	25s
test nightly	15s
test nightly --all-features	32s
test 1.65 --no-default-features	18s
test 1.65	20s
test 1.65 --all-features	36s
	8m 26s

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