refactor: use simple boolean for parity in signature #2093

Job	Run time
check no_std	45s
docs	55s
clippy	1m 10s
features stable	2m 3s
fmt	13s
features stable --all-targets	3m 19s
miri --no-default-features	4m 56s
features nightly	2m 27s
miri	5m 2s
test ubuntu-latest stable --no-default-features	1m 18s
features nightly --all-targets	3m 27s
wasm	35s
miri --all-features	6m 50s
test ubuntu-latest stable	1m 18s
test ubuntu-latest nightly --no-default-features	1m 14s
test ubuntu-latest nightly	1m 19s
test ubuntu-latest 1.79 --no-default-features	39s
test ubuntu-latest 1.79	40s
test windows-latest stable --no-default-features	2m 19s
test windows-latest stable	2m 59s
test windows-latest nightly --no-default-features	2m 30s
test windows-latest nightly	2m 32s
test windows-latest 1.79 --no-default-features	1m 20s
test windows-latest 1.79	1m 16s
test ubuntu-latest 1.79 --features json	41s
test windows-latest 1.79 --features json	1m 22s
test ubuntu-latest nightly --all-features	1m 25s
test windows-latest nightly --all-features	2m 53s
	57m 27s

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