feat: implement `cond`. #1999

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Run time

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Job	Run time
Test (msrv)	9m 29s
Test (stable)	9m 34s
Test (nightly)	10m 49s
Test (macos)	4m 17s
Test (win-msvc)	9m 5s
Test (no-default-features)	7m 41s
	50m 55s