refactor: use simple boolean for parity in signature #2094

Job	Run time
test ubuntu-latest stable --no-default-features	1m 14s
clippy	48s
check no_std	50s
test ubuntu-latest stable	1m 11s
test ubuntu-latest nightly --no-default-features	44s
docs	34s
test ubuntu-latest nightly	46s
features stable	2m 1s
test ubuntu-latest 1.79 --no-default-features	41s
features stable --all-targets	3m 17s
fmt	13s
test ubuntu-latest 1.79	39s
features nightly	1m 31s
test windows-latest stable --no-default-features	2m 34s
features nightly --all-targets	2m 48s
test windows-latest stable	2m 32s
miri --no-default-features	4m 48s
test windows-latest nightly --no-default-features	2m 0s
wasm	35s
test windows-latest nightly	2m 6s
test windows-latest 1.79 --no-default-features	1m 17s
miri	4m 41s
test windows-latest 1.79	1m 18s
miri --all-features	6m 49s
test ubuntu-latest 1.79 --features json	37s
test windows-latest 1.79 --features json	1m 20s
test ubuntu-latest nightly --all-features	1m 6s
test windows-latest nightly --all-features	2m 38s
	51m 38s

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