Method gcd

src/jvm/clojure/lang/Numbers.java:520–528

(long u, long v)

	}

	static long gcd(long u, long v){
		while(v != 0)
			{
			long r = u % v;
			u = v;
			v = r;
			}
		return u;
	}

	public Number divide(Number x, Number y){
		long n = x.longValue();