Fix offset ignored in typed array

Fixes peerjs issue 715

Author: SnowyCoder

lib/binarypack.js

@@ -300,9 +300,16 @@ Packer.prototype.pack = function (value) {
         }
       } else if ('BYTES_PER_ELEMENT' in value) {
         if (binaryFeatures.useArrayBufferView) {
-          this.pack_bin(new Uint8Array(value.buffer));
+          this.pack_bin(new Uint8Array(value.buffer, value.byteOffset, value.byteLength));
         } else {
-          this.pack_bin(value.buffer);
+          // Check if the typed array is a view over a larger ArrayBuffer
+          if (value.byteOffset !== 0 || value.byteLength !== value.buffer.byteLength) {
+            // If it is, copy it and use the new buffer
+            this.pack_bin(new Uint8Array(value).buffer);
+          } else {
+            // Otherwise use the buffer directly
+            this.pack_bin(value.buffer);
+          }
         }
       } else if ((constructor == Object) || (constructor.toString().startsWith('class'))) {
         this.pack_object(value);