function maxf( x, y ) {
	return addon( x, y );
}
Returns the maximum single-precision floating-point number.

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

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

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

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

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