docs: function() {
          // TODO: flatten output, likewise do it for Crafty.viewport.bounds
          // TODO: accept optional parameter to save result in
          this._updateBoundaries();
          var bounds = this.boundsCoords;
          return {
              min: {
                  x: bounds.minX,
                  y: bounds.minY
              },
              max: {
                  x: bounds.maxX,
                  y: bounds.maxY
              }
          };
      }