perf: improve normalize_v (#792) #2129

Job	Run time
miri --no-default-features	4m 52s
miri	4m 46s
clippy	48s
miri --all-features	7m 5s
check no_std	56s
docs	36s
features stable	2m 8s
features stable --all-targets	3m 26s
test ubuntu-latest stable --no-default-features	1m 15s
wasm	37s
features nightly	1m 35s
test ubuntu-latest stable	1m 16s
features nightly --all-targets	2m 44s
test ubuntu-latest nightly --no-default-features	49s
test ubuntu-latest nightly	53s
test ubuntu-latest 1.79 --no-default-features	40s
fmt	24s
test ubuntu-latest 1.79	36s
test windows-latest stable --no-default-features	3m 56s
test windows-latest stable	3m 35s
test windows-latest nightly --no-default-features	2m 21s
test windows-latest nightly	2m 3s
test windows-latest 1.79 --no-default-features	1m 36s
test windows-latest 1.79	1m 34s
test ubuntu-latest 1.79 --features json	42s
test windows-latest 1.79 --features json	1m 39s
test ubuntu-latest nightly --all-features	1m 11s
test windows-latest nightly --all-features	2m 28s
	56m 31s

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