[whatwg/streams] Do not assert that closing a readable byte stream cannot throw (PR #1388)

The "close a ReadableStream" algorithm for other specifications performs ! ReadableByteStreamControllerClose(), but that throws, after erroring the stream, when the first pending pull-into descriptor holds only part of an element. Fetch reaches this when a network body ends with a BYOB read pending, e.g., a 1-byte body read into a Uint16Array.

Fixes: https://github.com/whatwg/streams/issues/1387

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1388

-- Commit Summary --

  * Do not assert that closing a readable byte stream cannot throw

-- File Changes --

    M index.bs (7)

-- Patch Links --

https://github.com/whatwg/streams/pull/1388.patch
https://github.com/whatwg/streams/pull/1388.diff

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