def _override_if_set(self, lead: str, follow: str, defaulted: Set[str]) -> None:
        """If the value of the lead parameter was set explicitly, apply the value to follow, unless follow was also set explicitly."""
        if lead.lower() not in defaulted and follow.lower() in defaulted:
            object.__setattr__(self, follow.upper(), getattr(self, lead.upper(), None))
If the value of the lead parameter was set explicitly, apply the value to follow, unless follow was also set explicitly.
core/dbt/cli/flags.py