function max( x, y ) {
	return addon( x, y );
}
Returns the maximum value.

@private
@param {number} x - first number
@param {number} y - second number
@returns {number} maximum value

@example
var v = max( 4.2, 3.14 );
// returns 4.2

@example
var v = max( 0.0, -0.0 );
// returns -0.0

@example
var v = max( 3.14, NaN );
// returns NaN

@example
var v = max( NaN, 5.0 );
// returns 5.0