Macro `bench_specializations` #555

Job	Run time
check format	10s
test	1m 34s
check	19s
msrv	1m 34s
check (--no-default-features)	18s
check (--no-default-features --features use_alloc)	23s
check (--all-targets --all-features)	43s
All checks succeeded	1s
	5m 2s

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