fix(virtualstream): Fix handling of virtual streams for proper shutdown

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@api.global/typedrequest',
-  version: '3.1.0',
+  version: '3.1.1',
   description: 'A TypeScript library for making typed requests towards APIs, including facilities for handling requests, routing, and virtual stream handling.'
 }

ts/classes.virtualstream.ts

@@ -380,7 +380,7 @@ export class VirtualStream<T = Uint8Array> implements plugins.typedRequestInterf
 
   public async writeToWebstream(writableStreamArg: WritableStream<T>) {
     const writer = writableStreamArg.getWriter();
-    while(this.keepAlive) {
+    while(this.keepAlive || this.receiveBackpressuredArray.checkHasItems()) {
       await writer.write(await this.fetchData());
     }
   }