Test

add convenience into_mirrored method #337

Job	Run time
bench	55s
check_no_std	19s
check_fuzz	30s
test (1.75.0)	36s
test (1.75.0, --features variant)	39s
test (1.75.0, --features alloc)	40s
test (1.75.0, --features std)	37s
test (1.75.0, --features alloc,variant)	42s
test (1.75.0, --features std,variant)	37s
test (1.75.0, --features nohash-hasher,variant)	39s
test (stable)	40s
test (stable, --features variant)	33s
test (stable, --features alloc)	30s
test (stable, --features std)	33s
test (stable, --features alloc,variant)	36s
test (stable, --features std,variant)	49s
test (stable, --features nohash-hasher,variant)	32s
test (nightly)	35s
test (nightly, --features variant)	37s
test (nightly, --features alloc)	37s
test (nightly, --features std)	35s
test (nightly, --features alloc,variant)	36s
test (nightly, --features std,variant)	37s
test (nightly, --features nohash-hasher,variant)	37s
test (nightly, -Z minimal-versions --all-features)	38s
	15m 19s

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