Added a TODO comment in node-compat

Author: nandan-bhat

src/server/next-compat.ts

@@ -13,6 +13,7 @@ export function toNextRequest(input: Request | NextRequest): NextRequest {
   return new NextRequest(input.url, {
     method: input.method,
     headers: input.headers,
+    // TODO: We might need to handle the case where body is a ReadableStream
     body: input.body as any,
     duplex: (input as any).duplex ?? "half"
   });