Re: [whatwg/streams] ReadableStream.prototype.arrayBuffer() (#1019)

> Could you imagine what the fetch would look like instead if we had done `response.body.blob()`? then we would probably not have `response.blob()` in the first place

That would have delayed shipping fetch and therefore service workers for many years. Also, the methods on `response` are still useful, because:

- Space can be pre-allocated using the content-length
- The mime type on `Blob` can be filled in from the request/response content-type

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