Ensure pipeTo() calls the correct Release() depending on the chosen reader

Author: MattiasBuelens

index.bs

@@ -2219,7 +2219,9 @@ The following abstract operations operate on {{ReadableStream}} instances at a h
   * <dfn id="rs-pipeTo-finalize"><i>Finalize</i></dfn>: both forms of shutdown will eventually ask
     to finalize, optionally with an error |error|, which means to perform the following steps:
    1. Perform ! [$WritableStreamDefaultWriterRelease$](|writer|).
-   1. Perform ! [$ReadableStreamDefaultReaderRelease$](|reader|).
+   1. If |reader| [=implements=] {{ReadableStreamBYOBReader}}, perform
+      ! [$ReadableStreamBYOBReaderRelease$](|reader|).
+   1. Otherwise, perform ! [$ReadableStreamDefaultReaderRelease$](|reader|).
    1. If |signal| is not undefined, [=AbortSignal/remove=] |abortAlgorithm| from |signal|.
    1. If |error| was given, [=reject=] |promise| with |error|.
    1. Otherwise, [=resolve=] |promise| with undefined.