function cunone( x ) {
	var y = filled( true, x.length );
	return assign( x, y, 1, 0 );
}
Cumulatively tests whether at every element in a provided array is falsy.

@param {Collection} x - input array
@returns {Array} output array

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

var y = cunone( x );
// returns [ true, true, true, false, false ]