feat: add `AsRef` impl and `hash` method to `Sealed` (#804) #2158

Job	Run time
miri --no-default-features	5m 4s
miri	5m 29s
test ubuntu-latest stable --no-default-features	1m 16s
test ubuntu-latest stable	1m 33s
miri --all-features	7m 29s
test ubuntu-latest nightly --no-default-features	1m 19s
check no_std	39s
test ubuntu-latest nightly	1m 15s
test ubuntu-latest 1.79 --no-default-features	36s
test ubuntu-latest 1.79	41s
wasm	32s
test windows-latest stable --no-default-features	3m 0s
features stable	2m 9s
test windows-latest stable	3m 49s
features stable --all-targets	3m 17s
test windows-latest nightly --no-default-features	2m 57s
clippy	1m 12s
test windows-latest nightly	2m 58s
features nightly	2m 25s
test windows-latest 1.79 --no-default-features	1m 24s
features nightly --all-targets	3m 47s
docs	53s
test windows-latest 1.79	1m 24s
test ubuntu-latest 1.79 --features json	38s
test windows-latest 1.79 --features json	1m 27s
fmt	13s
test ubuntu-latest nightly --all-features	1m 23s
test windows-latest nightly --all-features	2m 56s
ci success	2s
	1h 1m 47s

Provide feedback