http: explain the unused argument in IncomingMessage._read

Ayase-252 · danielleadams · commit d63ac28a9a7b · 2021-02-16T09:12:57.000-05:00
PR-URL: #37275 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
diff --git a/lib/_http_incoming.js b/lib/_http_incoming.js
@@ -152,7 +152,10 @@ IncomingMessage.prototype.setTimeout = function setTimeout(msecs, callback) {
   return this;
 };
 
-
+// Argument n cannot be factored out due to the overhead of
+// argument adaptor frame creation inside V8 in case that number of actual
+// arguments is different from expected arguments.
+// Ref: https://bugs.chromium.org/p/v8/issues/detail?id=10201
 IncomingMessage.prototype._read = function _read(n) {
   if (!this._consuming) {
     this._readableState.readingMore = false;
