Add async `ready` support #347

Job	Run time
check (1.60.0, windows-latest)	3m 59s
check (1.60.0, ubuntu-latest)	3m 17s
check (stable, windows-latest)	1m 10s
check (stable, ubuntu-latest)	40s
check (nightly, windows-latest)	1m 5s
check (nightly, ubuntu-latest)	49s
	11m 0s

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