fix: await initial pushable read #151

Job	Run time
js-test-and-release / check	4m 50s
js-test-and-release / test-chrome	2m 47s
js-test-and-release / test-chrome-webworker	2m 35s
js-test-and-release / test-electron-main	29s
js-test-and-release / test-electron-renderer	22s
js-test-and-release / test-firefox-webworker	3m 41s
js-test-and-release / test-firefox	3m 47s
js-test-and-release / test-node (windows-latest, lts/*)	6m 13s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	10s
js-test-and-release / test-node (ubuntu-latest, lts/*)	2m 8s
js-test-and-release / test-webkit (macos-latest, lts/*)	4m 0s
js-test-and-release / test-node (macos-latest, lts/*)	5m 21s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	10s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	2m 27s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	39m 0s

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