Re: [whatwg/streams] Refactor TransformStream's backpressure handling (#571)

tyoshino commented on this pull request.



>  
-  if (transformStream._readableBackpressure !== backpressure) {
-    TransformStreamSetBackpressure(transformStream, backpressure);
+  if (maybeBackpressure === true && transformStream._backpressure === false) {
+    // This allows pull() again. When desiredSize is 0, it's possible that a pull() is made immediately (but
+    // asynchronously) after this because of pending read()s and fix _backpressure back to false.
+    //
+    // We don't have to worry about that such a pull() may happen synchronously to the enqueue(), and therefore is not

Changed to `pull() inside the enqueue()`. Maybe sufficient?

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