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

No idea what could be going on here :/
{
    BOOST_CHECK_EQUAL(
        HexStr(ParseHex_expected),
        "04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f");
    BOOST_CHECK_EQUAL(
        HexStr(Span<const unsigned char>(
               ParseHex_expected + sizeof(ParseHex_expected),
               ParseHex_expected + sizeof(ParseHex_expected))),
        "");
    BOOST_CHECK_EQUAL(
        HexStr(Span<const unsigned char>(ParseHex_expected, ParseHex_expected)),
        "");
    std::vector<unsigned char> ParseHex_vec(ParseHex_expected, ParseHex_expected + 5);
    BOOST_CHECK_EQUAL(
        HexStr(ParseHex_vec),
        "04678afdb0"
    );
}
BOOST_AUTO_TEST_CASE(util_Join)