Re: [streams] Real time source and skipping (#383)

The problem with using a Transform to accomplish this is that the transform's `writable` stream would have to apply no back pressure to consume new values, which wouldn't work if applied to a stream wrapping a pull source or a push source with back pressure support.
Whatever mechanism we come up with needs to be available in ReadableStream.

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https://github.com/whatwg/streams/issues/383#issuecomment-126477485