Source gem #820

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Job	Run time
Build	8s
Test (windows, head, 17.0-1-windows-x64, 17)	6m 34s
Test (windows, 2.7, 10.20-1-windows-x64, 10)	8m 3s
Test (windows, mswin, 17.0-1-windows-x64, 17)	4m 46s
Test (ubuntu, head, 17)	1m 3s
Test (ubuntu, 3.2, 12)	1m 17s
Test (ubuntu, 20.04, 2.7, 10)	1m 38s
Test (ubuntu, truffleruby, 14)	1m 35s
Test (ubuntu, truffleruby-head, 17)	2m 1s
Test (macos, head, 17.0-1-osx, 17)	1m 31s
	28m 36s

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