Re: [whatwg/fetch] Use case for Headers getAll (#973)

To be clear, `getAll()` with the semantics I think you are suggesting would be incompatible with what we'd add here, if anything, as HTTP doesn't require preserving the distinction between
```
h.append(name, value)
h.append(name, value2)
```
and
```
h.append(name, `${value}, ${value2}`)
```
for any _name_ other than `Set-Cookie` and this API shouldn't either. See also the discussion in #189.

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