[READY] Merge master into v2.x (please don't squash commits!) #388

Job	Run time
rubocop	15s
Unit test (ubuntu-20.04, 3)	1m 44s
Unit test (ubuntu-20.04, 3.1)	1m 48s
Unit test (ubuntu-20.04, 3.2)	1m 50s
Unit test (ubuntu-20.04, 3.3)	1m 49s
Unit test (ubuntu-20.04, jruby-9.4)	2m 29s
Unit test (ubuntu-20.04, truffleruby)	3m 47s
Unit test (macos-latest, 3)	1m 44s
Unit test (macos-latest, 3.1)	1m 59s
Unit test (macos-latest, 3.2)	1m 30s
Unit test (macos-latest, 3.3)	1m 33s
Unit test (macos-latest, jruby-9.4)	2m 0s
Unit test (macos-latest, truffleruby)	2m 29s
Unit test (windows-latest, 3)	4m 7s
Unit test (windows-latest, 3.1)	3m 5s
Unit test (windows-latest, 3.2)	3m 10s
Unit test (windows-latest, 3.3)	5m 0s
finish	2s
	40m 21s

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