code: function ( obj, arg, start, offset ) {
  		var fn  = typeof arg === "function",
  		    l   = obj.length,
  		    i   = !isNaN( start ) ? start : 0,
  		    nth = !isNaN( offset ) ? i + offset : l - 1;
  
  		if ( nth > ( l - 1) ) {
  			nth = l - 1;
  		}
  
  		while ( i <= nth ) {
  			obj[i] = fn ? arg( obj[i] ) : arg;
  			i++;
  		}
  
  		return obj;
  	}
docs: Fills `obj` with the evalution of `arg`, optionally from `start` to `offset`
  
  @method fill
  @param  {Array}  obj   Array to fill
  @param  {Mixed}  arg   String, Number of Function to fill with
  @param  {Number} start [Optional] Index to begin filling at
  @param  {Number} end   [Optional] Offset from start to stop filling at
  @return {Array}        Filled Array