code: function __expand(bytes) {
  
          // Resize buffer if more space needed
          if (length+bytes >= buffer.length) {
              var new_buffer = new Uint8Array((length+bytes)*2);
              new_buffer.set(buffer);
              buffer = new_buffer;
          }
  
          length += bytes;
  
      }
docs: Expands the size of the underlying buffer by the given number of bytes,
  updating the length appropriately.
  
  @private
  @param {Number} bytes The number of bytes to add to the underlying
  buffer.