Timestamp.opCmp

immutable t1 = Timestamp(12345678912340);
immutable t2 = Timestamp(12345678912341);
assert(t1 < t2);
assert(t1 <= t2);
assert(t2 > t1);
assert(t2 >= t1);

assert(!(t1 < t1));
assert(t1 <= t1);
assert(!(t1 > t1));
assert(t1 >= t1);