Macro `bench_specializations` #563

Job	Run time
check format	9s
check	6s
test	1m 8s
msrv	1m 42s
check (--no-default-features)	14s
check (--no-default-features --features use_alloc)	12s
check (--all-targets --all-features)	21s
All checks succeeded	2s
	3m 54s

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