code: function __send_blob(bytes) {
  
          var binary = "";
  
          // Produce binary string from bytes in buffer
          for (var i=0; i<bytes.byteLength; i++)
              binary += String.fromCharCode(bytes[i]);
  
          // Send as base64
          stream.sendBlob(window.btoa(binary));
  
      }
docs: Encodes the given data as base64, sending it as a blob. The data must
  be small enough to fit into a single blob instruction.
  
  @private
  @param {Uint8Array} bytes The data to send.