<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def as_subbundle(cls, name=None, title=None, title_plural=None):
 """ Wraps the given bundle so that it can be lazily instantiated. :param name: The slug for this bundle. :param title: The verbose name for this bundle. """

        return PromiseBundle(cls, name=name, title=title,
                                title_plural=title_plural)