feat: branch node decoding #45

Job	Run time
fmt	12s
docs	15s
clippy	15s
feature-checks	19s
miri --no-default-features	39s
test stable --no-default-features	16s
test stable	17s
miri	48s
test stable --all-features	31s
test beta --no-default-features	18s
miri --all-features	53s
test beta	17s
test beta --all-features	30s
test nightly --no-default-features	22s
test nightly	14s
test nightly --all-features	30s
test 1.65 --no-default-features	23s
test 1.65	25s
test 1.65 --all-features	43s
	8m 7s

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