Re: [whatwg/fetch] Return a `content-encoding` header for resource timing and more (PR #1796)

noamr left a comment (whatwg/fetch#1796)

> > To be clear, the header is not exposed to the website passively embedding the resource, but this getter is. I don't think I understand your suggestion, could you rephrase?
> 
> I think the website can get the arbitrary value like this: (I am new to this area so please correct me if I am wrong)
> 
> ```
> let myCoding = myHeaders.get("Content-Encoding");  //  |myCoding| can be a proprietary compression, i.e., an arbitrary value.
> ```

You would only get access to `myHeaders` if this is an actual `fetch` or via a service worker; Those channels are not always available.

> 
> And the reason for that is some use cases involving service workers. See [w3c/resource-timing#381](https://github.com/w3c/resource-timing/issues/381)
> 
> but the `contentEncoding` field in `resourceTiming` is filtered, where only a few pre-determined values are permitted.

Yea, so filtering them when assigning to the struct wouldn't change anything observable, but any future user of that struct would get the filtered value.

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