atom.js
function (keyOrList, func) { // alias: `bind`
				listeners.unshift({ keys: toArray(keyOrList), cb: func,
					calls: Infinity });
				return me;
			}
function (keyOrList, func) { // alias: `bind`
				listeners.unshift({ keys: toArray(keyOrList), cb: func,
					calls: Infinity });
				return me;
			}
function ( keyOrList , func ) { // alias: `bind` listeners . unshift ( { keys : toArray ( keyOrList ) , cb : func , calls : Infinity } ) ; return me ; }
Call `func` whenever any of the specified keys change.  The values of the keys will be provided as args to func.
Call func whenever any of the specified keys change . The values of the keys will be provided as args to func .