Document FetchResponse#contentType as nullable #211
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The value doesn't always exist (on a 204/no content response for example). That fact is already implied by [an explicit falsy check somewhere else](https://github.com/hotwired/turbo/blob/ea54ae5ad4b6b28cb62ccd62951352641ed08293/src/http/fetch_response.js#L33). MDN docs say [accessing missing header returns null](https://developer.mozilla.org/en-US/docs/Web/API/Headers/get).
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The value doesn't always exist (on a 204/no content response for example). That fact is already implied by an explicit falsy check somewhere else.
MDN docs say accessing missing header returns null.