function lcm( a, b ) {
	return addon( a, b );
}
Computes the least common multiple (lcm).

@private
@param {integer} a - integer
@param {integer} b - integer
@returns {number} least common multiple

@example
var v = lcm( 21.0, 6.0 );
// returns 42.0

@example
var v = lcm( 3.14, 6.0 );
// returns NaN

@example
var v = lcm( NaN, 6.0 );
// returns NaN