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

No idea what could be going on here :/
{
    BOOST_CHECK_EQUAL(ToLower('@'), '@');
    BOOST_CHECK_EQUAL(ToLower('A'), 'a');
    BOOST_CHECK_EQUAL(ToLower('Z'), 'z');
    BOOST_CHECK_EQUAL(ToLower('['), '[');
    BOOST_CHECK_EQUAL(ToLower(0), 0);
    BOOST_CHECK_EQUAL(ToLower('\xff'), '\xff');
    BOOST_CHECK_EQUAL(ToLower(""), "");
    BOOST_CHECK_EQUAL(ToLower("#HODL"), "#hodl");
    BOOST_CHECK_EQUAL(ToLower("\x00\xfe\xff"), "\x00\xfe\xff");
}
BOOST_AUTO_TEST_CASE(test_ToUpper)
{
    BOOST_CHECK_EQUAL(ToUpper('`'), '`');
    BOOST_CHECK_EQUAL(ToUpper('a'), 'A');
    BOOST_CHECK_EQUAL(ToUpper('z'), 'Z');
    BOOST_CHECK_EQUAL(ToUpper('{'), '{');
    BOOST_CHECK_EQUAL(ToUpper(0), 0);
    BOOST_CHECK_EQUAL(ToUpper('\xff'), '\xff');
    BOOST_CHECK_EQUAL(ToUpper(""), "");
    BOOST_CHECK_EQUAL(ToUpper("#hodl"), "#HODL");
    BOOST_CHECK_EQUAL(ToUpper("\x00\xfe\xff"), "\x00\xfe\xff");
}
BOOST_AUTO_TEST_CASE(test_Capitalize)
{
    BOOST_CHECK_EQUAL(Capitalize(""), "");
    BOOST_CHECK_EQUAL(Capitalize("bitcoin"), "Bitcoin");
    BOOST_CHECK_EQUAL(Capitalize("\x00\xfe\xff"), "\x00\xfe\xff");
}
static std::string SpanToStr(Span<const char>& span)