Re: [heycam/webidl] Is a TypedArray a sequence? (#868)

The argument in question is `optional sequence<BlobPart>`, where BlobPart is `(BufferSource or Blob or USVString)`, and where `Blob` is the interface type whose constructor this is.

You’re correct that a TypedArray can be converted to a sequence. But that’s exactly what you’re seeing. The members of the iterable become strings because they’re originally numbers — and numbers can be coerced to USVString (in BlobPart) but not BufferSource of Blob.

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