Re: [whatwg/streams] Rigorously specify and test pipeTo (#512)

tyoshino commented on this pull request.



> +     discretion.
+  1. Otherwise, let _reader_ be ! AcquireReadableStreamDefaultReader(*this*).
+  1. Let _writer_ be ! AcquireWritableStreamDefaultWriter(_dest_).
+  1. Let _promise_ be a new promise.
+  1. Let _shuttingDown_ be *false*.
+  1. <a>In parallel</a>, using _reader_ and _writer_, read all <a>chunks</a> from *this* and write them to _dest_. Due
+     to the locking provided by the reader and writer, the exact manner in which this happens is not observable to
+     author code, and so there is flexibility in how this is done. The following constraints apply regardless of the
+     exact algorithm used:
+     * <strong>Public API must not be used:</strong> while reading or writing, or performing any of the operations
+       below, the JavaScript-modifiable reader, writer, and stream APIs (i.e. methods on the appropriate prototypes)
+       must not be used. Instead, the streams must be manipulated directly.
+     * <strong>Backpressure must be enforced:</strong>
+       * While WritableStreamDefaultWriterGetDesiredSize(_writer_) is ≤ *0* or is *null*, the user agent must not read
+         from _reader_.
+       * If _reader_ is a <a>BYOB reader</a>, WritableStreamDefaultWriterGetDesiredSize(_writer_) should be used to

Ohh, never mind. Sorry.

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