Re: [whatwg/streams] make TransformStream respect backpressure (#550)

isonmad commented on this pull request.



>      assert(this._writableController !== undefined);
     assert(this._readableController !== undefined);
 
+    const desiredSize = this._readableController.desiredSize;
+    TransformStreamSetBackpressure(this, desiredSize <= 0);

`TransformStreamSetBackpressure(this, true)` does the exact opposite of suppressing `pull()`. It sets backpressure to true, meaning pull is NOT suppressed.

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