function internal( x ) {
	var i;
	for ( i = 0; i < x.length; i++ ) {
		if ( !x[ i ] ) {
			return false;
		}
	}
	return true;
}
Tests whether all elements in an array are truthy.

@private
@param {Collection} x - input array
@returns {boolean} boolean indicating whether all elements are truthy

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

var out = internal( x );
// returns true

@example
var x = [ 1, 2, 0, 4 ];

var out = internal( x );
// returns false