function pop( obj ) {
	var len;
	var v;
	if ( obj.length === 0 ) {
		return [ obj, void 0 ];
	}
	len = obj.length - 1;
	v = obj[ len ];
	delete obj[ len ];
	obj.length = len;
	return [ obj, v ];
}
Removes and returns the last element of an array-like object.

@private
@param {Object} obj - input array-like object
@returns {Array} input object and the removed element

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

var out = pop( obj );
// returns [ { 'length': 1, '0': 1.0 }, 2.0 ]