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

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

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

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

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