fix: constrain the unixfs type (#435) #387

Job	Run time
js-test-and-release / build	1m 5s
js-test-and-release / check	1m 3s
js-test-and-release / test-node (windows-latest, lts/*)	3m 43s
js-test-and-release / test-chrome	1m 3s
js-test-and-release / test-node (ubuntu-latest, lts/*)	55s
js-test-and-release / test-node (macos-latest, lts/*)	2m 21s
js-test-and-release / test-chrome-webworker	20s
js-test-and-release / test-firefox	1m 20s
js-test-and-release / test-firefox-webworker	17s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	59s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 40s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	1m 1s
js-test-and-release / test-electron-main	33s
js-test-and-release / test-electron-renderer	1m 7s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 47s
js-test-and-release / release-check	2s
js-test-and-release / release	2m 15s
	21m 31s

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