chore: improve error implementations #2873

Job	Run time
check no-default-features	23s
check serde	20s
test stable --no-default-features	50s
test stable	49s
test no_std	19s
test stable --all-features	1m 13s
check std	15s
test beta --no-default-features	51s
clippy	1m 9s
test beta	51s
test beta --all-features	1m 11s
docs	1m 4s
test nightly --no-default-features	53s
fmt	7s
test nightly	1m 7s
test nightly --all-features	1m 20s
	12m 42s

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