function indexed( x, y, stride, offset ) {
	var flg;
	var io;
	var i;

	flg = true;
	io = offset;
	for ( i = 0; i < x.length; i++ ) {
		if ( flg === true && x[ i ] ) {
			flg = false;
		}
		y[ io ] = flg;
		io += stride;
	}
	return y;
}
Cumulatively tests whether every element in an indexed array is falsy.

@private
@param {Collection} x - input array
@param {Collection} y - output array
@param {integer} stride - output array stride
@param {NonNegativeInteger} offset - output array offset
@returns {Collection} output array

@example
var x = [ false, false, false, true, false ];
var y = [ false, null, false, null, false, null, false, null, false, null ];

var out = indexed( x, y, 2, 0 );
// returns [ true, null, true, null, true, null, false, null, false, null ]