function prepend( obj, items ) {
	var len;
	var n;
	var i;

	len = obj.length;
	n = items.length;

	// Shift all existing elements to the right...
	for ( i = len-1; i >= 0; i-- ) {
		obj[ i+n ] = obj[ i ];
	}
	// Add new elements...
	for ( i = 0; i < n; i++ ) {
		obj[ i ] = items[ i ];
	}
	obj.length = len + n;
	return obj;
}
Adds elements from a collection to the beginning of an array-like object.

@private
@param {Object} obj - input array-like object
@param {ArrayLike} items - items to add
@returns {Object} input object

@example
var obj = {
    'length': 2,
    '0': 1.0,
    '1': 2.0
};

obj = prepend( obj, [ 3.0, 4.0 ] );
// returns { 'length': 4, '0': 3.0, '1': 4.0, '2': 1.0, '3': 2.0 }