Merge remote-tracking branch 'origin/dart3a' into dart3a #288

Job	Run time
Test on ubuntu-latest / 2.19.6	12s
Test on ubuntu-latest / stable	1m 47s
Test on ubuntu-latest / beta	3m 11s
Test on ubuntu-latest / dev	2m 16s
Test on windows-latest / 2.19.6	29s
Test on windows-latest / stable	2m 55s
Test on windows-latest / beta	3m 1s
Test on windows-latest / dev	4m 10s
Test on macos-latest / 2.19.6	29s
Test on macos-latest / stable	2m 25s
Test on macos-latest / beta	2m 5s
Test on macos-latest / dev	2m 43s
	25m 43s

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