Why doesn't `allow_unregistered` work for me?

I still get `too many positional options have been specified on the command line` on `run()`

The excerpt

```c++
boost::program_options::variables_map vm;
try{
auto parsed = boost::program_options::command_line_parser(rawArgs.argc, rawArgs.argv).options(oDesc).positional(pd).allow_unregistered().run(); //too many positional options have been specified on the command line
boost::program_options::store(parsed, vm);
boost::program_options::notify(vm);
auto rest = boost::program_options::collect_unrecognized(parsed.options, boost::program_options::collect_unrecognized_mode::include_positional);
} catch(std::exception &ex) {
PROCESS_CASE_OF_SYNTAX_ERROR_WHATABLE_EXCEPTION(ex);
}
```

The full source is here: https://github.com/HydrArgs/HydrArgs/blob/master/backends/BoostArgs.cpp