func_get_arg warning

Maybe a false positive?

The particular lines should only be relevant for modules that extended that class against the very briefly used parameter order in 1.22 and 1.23.

I think I counted wrong when specifying the parameter index through 😬

I fixed my off-by-one, and helped confirm that there shouldn't be any issues with func_get_arg() by adding a couple tests of the possible parameters that could be passed if the module was being extended based on an older module version.