Macro `bench_specializations` #552

Job	Run time
test	1m 24s
msrv	1m 48s
check format	10s
check	13s
check (--no-default-features)	12s
check (--no-default-features --features use_alloc)	9s
check (--all-targets --all-features)	35s
All checks succeeded	1s
	4m 32s

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