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

An interesting use of `.blob()` that I hadn't thought of is to efficiently handle streams that would use excessive amounts of memory to load completely, and so would ideally be stored on disk. The platform doesn't provide a primitive to stream data into a Blob, but it appears implementations do have this as part of their implementation of the `blob()` method on `Response`.

See https://stackoverflow.com/questions/67362823/progress-for-a-fetch-blob-javascript/67364010#67364010 for an example we could make much cleaner.

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