perf: improve normalize_v #2122

Job	Run time
check no_std	51s
docs	53s
clippy	41s
features stable	2m 16s
fmt	13s
features stable --all-targets	3m 29s
features nightly	2m 29s
miri --no-default-features	5m 7s
features nightly --all-targets	3m 47s
test ubuntu-latest stable --no-default-features	1m 9s
miri	5m 3s
wasm	39s
test ubuntu-latest stable	1m 9s
miri --all-features	7m 46s
test ubuntu-latest nightly --no-default-features	1m 13s
test ubuntu-latest nightly	1m 17s
test ubuntu-latest 1.79 --no-default-features	36s
test ubuntu-latest 1.79	26s
test windows-latest stable --no-default-features	3m 16s
test windows-latest stable	2m 34s
test windows-latest nightly --no-default-features	2m 43s
test windows-latest nightly	3m 17s
test windows-latest 1.79 --no-default-features	1m 11s
test windows-latest 1.79	1m 36s
test ubuntu-latest 1.79 --features json	29s
test windows-latest 1.79 --features json	1m 1s
test ubuntu-latest nightly --all-features	1m 23s
test windows-latest nightly --all-features	2m 56s
	59m 30s

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