perf: remove bounds check in DUP, SWAP/EXCHANGE #3284

Job	Run time
check no-default-features	28s
check serde	22s
check std	21s
clippy	1m 10s
docs	1m 14s
fmt	8s
test stable --no-default-features	1m 11s
test no_std	23s
test stable	47s
test stable --all-features	1m 15s
test beta --no-default-features	55s
test beta	51s
test beta --all-features	1m 25s
test nightly --no-default-features	56s
test nightly	53s
test nightly --all-features	1m 20s
	13m 39s

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