function add( x, y ) {
	// Cast `x` and `y` to signed 32-bit integers and apply a mask which keeps only the lowest 8 bits:
	return ( (x|0) + (y|0) ) & MASK;
}
Computes the sum of two unsigned 8-bit integers `x` and `y`.

@param {integer} x - first input value
@param {integer} y - second input value
@returns {integer} sum

@example
var v = add( 1, 5 );
// returns 6

@example
var v = add( 2, 5 );
// returns 7

@example
var v = add( 0, 5 );
// returns 5