v2.0: Merge latest master into v2.0 #239

Job	Run time
Unit test (ubuntu-20.04, 2.6)	18s
Unit test (ubuntu-20.04, 2.7)	30s
Unit test (ubuntu-20.04, 3)	18s
Unit test (ubuntu-20.04, 3.1)	16s
Unit test (ubuntu-20.04, 3.2)	18s
Unit test (ubuntu-20.04, jruby-9.3)	12s
Unit test (ubuntu-20.04, jruby-9.4)	49s
Unit test (ubuntu-20.04, truffleruby)	1m 43s
Unit test (macos-latest, 2.6)	25s
Unit test (macos-latest, 2.7)	41s
Unit test (macos-latest, 3)	20s
Unit test (macos-latest, 3.1)	21s
Unit test (macos-latest, 3.2)	20s
Unit test (macos-latest, jruby-9.3)	13s
Unit test (macos-latest, truffleruby)	1m 39s
finish	0s
	8m 23s

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