fix remaining WPT fail

lib/fetch/index.js

@@ -1110,7 +1110,27 @@ function fetchFinale (fetchParams, response) {
 
     // 4. Set internalResponse’s body’s stream to the result of internalResponse’s body’s stream piped through transformStream.
     internalResponse.body.stream.pipeThrough(transformStream)
-    internalResponse.body.stream = transformStream.readable
+
+    const byteStream = new ReadableStream({
+      readableStream: transformStream.readable,
+      async start (controller) {
+        const reader = this.readableStream.getReader()
+
+        while (true) {
+          const { done, value } = await reader.read()
+
+          if (done) {
+            queueMicrotask(() => readableStreamClose(controller))
+            break
+          }
+
+          controller.enqueue(value)
+        }
+      },
+      type: 'bytes'
+    })
+
+    internalResponse.body.stream = byteStream
   }
 }