fix: cloudflare dns only supports string type #20

Job	Run time
js-test-and-release / check	1m 6s
js-test-and-release / test-chrome	29s
js-test-and-release / test-chrome-webworker	33s
js-test-and-release / test-electron-main	29s
js-test-and-release / test-electron-renderer	17s
js-test-and-release / test-firefox	25s
js-test-and-release / test-firefox-webworker	28s
js-test-and-release / test-node (windows-latest, lts/*)	1m 52s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	46s
js-test-and-release / test-node (ubuntu-latest, lts/*)	22s
js-test-and-release / test-webkit (macos-latest, lts/*)	2m 5s
js-test-and-release / test-node (macos-latest, lts/*)	2m 37s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	1m 2s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	4m 47s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	17m 18s

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