Replace the named argument in ``args, kwargs`` with ``new_value``.

        Returns ``(old_value, args, kwargs)``.  The returned ``args`` and
        ``kwargs`` objects may not be the same as the input objects, or
        the input objects may be mutated.

        If the named argument was not found, ``new_value`` will be added
        to ``kwargs`` and None will be returned as ``old_value``.

def replace(
        self, new_value: Any, args: Sequence[Any], kwargs: Dict[str, Any]
    ) -> Tuple[Any, Sequence[Any], Dict[str, Any]]:
        """Replace the named argument in ``args, kwargs`` with ``new_value``.

        Returns ``(old_value, args, kwargs)``.  The returned ``args`` and
        ``kwargs`` objects may not be the same as the input objects, or
        the input objects may be mutated.

        If the named argument was not found, ``new_value`` will be added
        to ``kwargs`` and None will be returned as ``old_value``.
        """
        if self.arg_pos is not None and len(args) > self.arg_pos:
            # The arg to replace is passed positionally
            old_value = args[self.arg_pos]
            args = list(args)  # *args is normally a tuple
            args[self.arg_pos] = new_value
        else:
            # The arg to replace is either omitted or passed by keyword.
            old_value = kwargs.get(self.name)
            kwargs[self.name] = new_value
        return old_value, args, kwargs