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fix: explicitly start `MessagePort` #367

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Run time

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Job	Run time
Test (macos-latest, 20.x)	36s
Test (macos-latest, 18.x)	44s
Test (windows-latest, 18.x)	1m 31s
Test (ubuntu-latest, 20.x)	32s
Test (ubuntu-latest, 18.x)	48s
Test (windows-latest, 20.x)	2m 39s
	6m 50s