code: function ZXYStream(source, options) {
      if (!source) throw new TypeError('MBTiles source required');
  
      options = options || {};
  
      this.source = source;
      this.batch = options.batch || 1000;
  
      stream.Readable.call(this);
  }
docs: Readable stream of line-delimited z/x/y coordinates contained within the MBTiles `tiles` table/view.