is important is
        that code that places data here adheres to the general semantics of
        the system.

        Example usage::

            LANG_KEY = __name__ + '.lang'

            def set_language(value):
                ctx = get_current_context()
                ctx.meta[LANG_KEY] = value

            def get_language():
                return get_current_context().meta.get(LANG_KEY, 'en_US')

        .. versionadded:: 5.0
        )