 Improve performance of functions where thisArg === undefined #756
 Improve performance of functions where thisArg === undefined #756

KonstantinShemyak/cytoscape.js,rlugojr/cytoscape.js,soomin-maeng/cytoscape.js,KonstantinShemyak/cytoscape.js,rlugojr/cytoscape.js,soomin-maeng/cytoscape.js