function indexed( x, value, start, end ) {
	var i;
	for ( i = start; i < end; i++ ) {
		x[ i ] = value;
	}
	return x;
}
Fills all elements within a portion of an indexed array with a specified value.

@private
@param {Collection} x - input array
@param {*} value - fill value
@param {integer} start - starting index (inclusive)
@param {integer} end - ending index (exclusive)
@returns {Array} output array

@example
var x = [ 1, 2, 3, 4 ];

var out = indexed( x, 5, 1, 3 );
// returns [ 1, 5, 5, 4 ]