Merging from dart3a #218

Job	Run time
Test on ubuntu-latest / 3.0.5	3m 18s
Test on ubuntu-latest / stable	3m 28s
Test on ubuntu-latest / beta	3m 0s
Test on ubuntu-latest / dev	3m 25s
Test on windows-latest / 3.0.5	5m 24s
Test on windows-latest / stable	5m 29s
Test on windows-latest / beta	5m 20s
Test on windows-latest / dev	5m 31s
Test on macos-latest / 3.0.5	6m 32s
Test on macos-latest / stable	8m 0s
Test on macos-latest / beta	5m 5s
Test on macos-latest / dev	6m 15s
	1h 0m 47s

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