Names of Dajngo settings variables are not valid names

[inaltoasinistra]

Hello,
I get this error when I try to override a Django settings variable.

Invalid setting name, settings.MAINTENANCE already defined in django.conf.settings.

    def clean_name(self):
        value = self.cleaned_data.get("name", "")
        if settings.EXTRA_SETTINGS_ENFORCE_UPPERCASE_SETTINGS:
            value = enforce_uppercase_setting(value)
        if hasattr(settings, value):
            raise forms.ValidationError(
                f"Invalid setting name, settings.{value} already "
                "defined in django.conf.settings."
            )
        return value

Why this is a problem? Setting offer the Django settings as fallback, so why shouldn't I override existing settings?
Thank you :)

[fabiocaccamo]

Let's continue in #165