pref: improve `decode_raw` (#34) #108

Job	Run time
docs	15s
clippy	14s
feature checks	25s
fmt	13s
check WASM	15s
test stable --no-default-features	15s
test stable	18s
test stable --all-features	20s
test beta --no-default-features	18s
test beta	18s
test beta --all-features	18s
test nightly --no-default-features	14s
test nightly	15s
test nightly --all-features	15s
test 1.64 --no-default-features	1m 45s
test 1.64	1m 38s
test 1.64 --all-features	1m 41s
deny / cargo deny check	13s
	9m 10s

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