Allow byob reads of Request/Response bodies

Author: mrbbot

packages/core/src/standards/event.ts

@@ -9,7 +9,7 @@ import {
 } from "@miniflare/shared";
 import { Response as BaseResponse, fetch as baseFetch } from "undici";
 import { DOMException } from "./domexception";
-import { Request, Response, kInner, withWaitUntil } from "./http";
+import { Request, Response, _kInner, withWaitUntil } from "./http";
 
 export type FetchErrorCode =
   | "ERR_RESPONSE_TYPE" // respondWith returned non Response promise
@@ -408,7 +408,7 @@ export class ServiceWorkerGlobalScope extends WorkerGlobalScope {
 
     // noinspection ES6MissingAwait
     const waitUntil = Promise.all(event[kWaitUntil]) as Promise<WaitUntil>;
-    return withWaitUntil(await baseFetch(request[kInner]), waitUntil);
+    return withWaitUntil(await baseFetch(request[_kInner]), waitUntil);
   }
 
   async [kDispatchScheduled]<WaitUntil extends any[] = any[]>(