Reset minimum fill when read request becomes detached

Author: MattiasBuelens

index.bs

@@ -1951,6 +1951,8 @@ counterparts for default controllers, as discussed in [[#rs-abstract-ops-used-by
  1. If [=this=].[=ReadableByteStreamController/[[pendingPullIntos]]=] is not [=list/is empty|empty=],
   1. Let |firstPendingPullInto| be [=this=].[=ReadableByteStreamController/[[pendingPullIntos]]=][0].
   1. Set |firstPendingPullInto|'s [=pull-into descriptor/reader type=] to "`none`".
+  1. Set |firstPendingPullInto|'s [=pull-into descriptor/minimum fill=] to |firstPendingPullInto|'s
+     [=pull-into descriptor/element size=].
   1. Set [=this=].[=ReadableByteStreamController/[[pendingPullIntos]]=] to the [=list=]
      « |firstPendingPullInto| ».
 </div>

reference-implementation/lib/ReadableByteStreamController-impl.js

@@ -104,6 +104,7 @@ exports.implementation = class ReadableByteStreamControllerImpl {
     if (this._pendingPullIntos.length > 0) {
       const firstPullInto = this._pendingPullIntos[0];
       firstPullInto.readerType = 'none';
+      firstPullInto.minimumFill = firstPullInto.elementSize;
 
       this._pendingPullIntos = [firstPullInto];
     }