code: function () {
              return (isFinite(this.pos.x) && isFinite(this.pos.y) && isFinite(this._width) && isFinite(this._height));
          }
docs: determines whether all coordinates of this rectangle are finite numbers.
  @name isFinite
  @memberOf me.Rect.prototype
  @function
  @return {boolean} false if all coordinates are positive or negative Infinity or NaN; otherwise, true.