def _all(registry, effective_name, objct):
    """
    Assign all of the possible options.

    Collect all registered items into a set,
    and assign that set to a name. Note that
    even if only one item is assigned to a name,
    that name will be assigned to a set of length 1.
    """
    myset = registry.get(effective_name, set())
    myset.add(objct)
    return myset