Money.add() still sometimes return wrong value

[dan-lind]

Opening a new ticket since I'm not sure what is the root cause, and the number returned is not negative. Rough testcase:

public void testBigDecimals() {
        Money sum = MoneyFactory.fromCharSequence("22543.6089278196672");
        Money toAdd = MoneyFactory.fromCharSequence("805.694827586206976");
        Money newSum = sum.add(toAdd);
        assertTrue("Value too small: " + newSum, newSum.toDouble() > 22000);
}

The sum here should be something above 23000, but this test fails with:
Value too small: 4902.55968169632256

[mikvor]

Added 2 more overflow checks.