https://twitter.com/2btc10000pizzas/status/1303768424133398528

No idea what could be going on here :/
{
    BOOST_CHECK_EQUAL(IsDigit('0'), true);
    BOOST_CHECK_EQUAL(IsDigit('1'), true);
    BOOST_CHECK_EQUAL(IsDigit('8'), true);
    BOOST_CHECK_EQUAL(IsDigit('9'), true);
    BOOST_CHECK_EQUAL(IsDigit('0' - 1), false);
    BOOST_CHECK_EQUAL(IsDigit('9' + 1), false);
    BOOST_CHECK_EQUAL(IsDigit(0), false);
    BOOST_CHECK_EQUAL(IsDigit(1), false);
    BOOST_CHECK_EQUAL(IsDigit(8), false);
    BOOST_CHECK_EQUAL(IsDigit(9), false);
}
BOOST_AUTO_TEST_CASE(test_ParseInt32)