code: function Blob(chunks, opts) {
        chunks = chunks || []
        for (var i = 0, len = chunks.length; i < len; i++) {
          var chunk = chunks[i]
          if (chunk instanceof Blob) {
            chunks[i] = chunk._buffer
          } else if (typeof chunk === 'string') {
            chunks[i] = toUTF8Array(chunk)
          } else if (arrayBufferSupported && (ArrayBuffer.prototype.isPrototypeOf(chunk) || isArrayBufferView(chunk))) {
            chunks[i] = bufferClone(chunk)
          } else if (arrayBufferSupported && isDataView(chunk)) {
            chunks[i] = bufferClone(chunk.buffer)
          } else {
            chunks[i] = toUTF8Array(String(chunk))
          }
        }
  
        this._buffer = [].concat.apply([], chunks)
        this.size = this._buffer.length
        this.type = opts ? opts.type || '' : ''
      }
docs: ***************************************************** /*                   Blob constructor *****************************************************