Single byte signatures won't work at all

Code snippet I've used:
```
const std::span<uint8_t>& body;
// ...
const auto scanResult = Pattern16::scan(body.data(), body.size(), "C3");
const auto scanOffset = static_cast<uint8_t*>(const_cast<void*>(scanResult)) - body.data();
if (scanOffset == 0) {
    return -1; // hit EVERY single time..
}
return scanOffset;
```