Re: [streams] Add readableAmount getter to ReadableByteStream (#279)

FWIW if the solution for the MSE case is being moved to only being addressed by ReadableByteStream, then I don't think readableAmount is needed. If I understand the ReadableByteStream correctly, I think MSE should simply be able to call readInto() with the size it needs and everything would be fine. It looks like readInto() essentially acts like POSIX read() so that would be sufficient for MSE's needs.

I suppose this is a long way of saying, don't add readableAmount just for MSE. :)

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