rewind(bytes) {
    goog.asserts.assert(bytes >= 0, 'Bad call to DataViewReader.rewind');
    if (this.position_ < bytes) {
      throw this.outOfBounds_();
    }
    this.position_ -= bytes;
  }
Rewinds the specified number of bytes.
@param {number} bytes The number of bytes to rewind.
@export