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Add limited MRT support #722

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Run time

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Job	Run time
test (ubuntu-latest, 1.76)	1m 39s
test (ubuntu-latest, stable)	1m 41s
test (ubuntu-latest, beta)	1m 11s
test (windows-latest, 1.76)	2m 33s
test (windows-latest, stable)	3m 3s
test (windows-latest, beta)	1m 53s
test (macOS-latest, 1.76)	2m 0s
test (macOS-latest, stable)	1m 36s
test (macOS-latest, beta)	1m 29s
	17m 5s