fix: support Blobs nested in objects

Closes #1163

e2e/datachannel/blobs.js

@@ -2,6 +2,7 @@ import { commit_data } from "../data.js";
 import { expect } from "https://esm.sh/v126/chai@4.3.7/X-dHMvZXhwZWN0/es2021/chai.bundle.mjs";
 
 const Encoder = new TextEncoder();
+const Decoder = new TextDecoder();
 
 /** @param {unknown[]} received */
 export const check = (received) => {
@@ -10,6 +11,8 @@ export const check = (received) => {
 		(blob) => Encoder.encode(JSON.stringify(blob)).buffer,
 	);
 	expect(received).to.deep.equal(commits_as_arraybuffer);
+	const parsed_received = received.map((r) => JSON.parse(Decoder.decode(r)));
+	expect(parsed_received).to.deep.equal(commit_data);
 };
 /**
  * @param {import("../peerjs").DataConnection} dataConnection

lib/dataconnection/BufferedConnection/BinaryPack.ts

@@ -75,16 +75,11 @@ export class BinaryPack extends BufferedConnection {
 		}
 	}
 
-	protected override _send(
-		data: Packable,
-		chunked: boolean,
-	): void | Promise<void> {
-		if (data instanceof Blob) {
-			return data.arrayBuffer().then((buffer) => {
-				this._send(buffer, chunked);
-			});
-		}
+	protected override _send(data: Packable, chunked: boolean) {
 		const blob = pack(data);
+		if (blob instanceof Promise) {
+			return this._send_blob(blob);
+		}
 
 		if (!chunked && blob.byteLength > this.chunker.chunkedMTU) {
 			this._sendChunks(blob);
@@ -93,6 +88,15 @@ export class BinaryPack extends BufferedConnection {
 
 		this._bufferedSend(blob);
 	}
+	private async _send_blob(blobPromise: Promise<ArrayBufferLike>) {
+		const blob = await blobPromise;
+		if (blob.byteLength > this.chunker.chunkedMTU) {
+			this._sendChunks(blob);
+			return;
+		}
+
+		this._bufferedSend(blob);
+	}
 
 	private _sendChunks(blob: ArrayBuffer) {
 		const blobs = this.chunker.chunk(blob);

package.json

@@ -218,7 +218,7 @@
 		"@msgpack/msgpack": "^2.8.0",
 		"cbor-x": "^1.5.3",
 		"eventemitter3": "^4.0.7",
-		"peerjs-js-binarypack": "^2.0.0",
+		"peerjs-js-binarypack": "^2.1.0",
 		"webrtc-adapter": "^8.0.0"
 	},
 	"alias": {