Re: [streams] How will ReadableByteStream work with seekable resources? (#253)

I now think "correspondence between pull() and read()" is less important compared to the other perspectives.

I'm leaning toward making `getReader()` only succeeds when there's no pending `read()`. Maybe I'd represent that (lockable or not) using some attribute on the stream. After thinking carefully, I don't think there's any big benefit to allow acquisition of lock while there's pending `read()`.

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