Return a dict that uses this server's IRC casemapping.

        All keys in this dictionary are stored and compared using this server's casemapping.

def idict(self, in_dict={}):
        """Return a dict that uses this server's IRC casemapping.

        All keys in this dictionary are stored and compared using this server's casemapping.
        """
        new_dict = IDict(in_dict)
        new_dict.set_std(self.features.get('casemapping'))
        if not self._casemap_set:
            self._imaps.append(new_dict)
        return new_dict