[whatwg/fetch] Incremental read: Why only Uint8Array instead of BufferSource? (Issue #1724)

### What is the issue with the Fetch Standard?

https://fetch.spec.whatwg.org/#incrementally-read-loop

>[chunk steps](https://streams.spec.whatwg.org/#read-request-chunk-steps), given chunk
>  1. Let continueAlgorithm be null.
>  2. If chunk is not a [Uint8Array](https://webidl.spec.whatwg.org/#idl-Uint8Array) object, then set continueAlgorithm to this step: run processBodyError given a [TypeError](https://webidl.spec.whatwg.org/#exceptiondef-typeerror).

But maybe it can accept BufferSource instead?

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