In the event a value that has technically already expired is loaded, swap it for None.

def from_mongo(cls, data, expired=False, **kw):
		"""In the event a value that has technically already expired is loaded, swap it for None."""
		
		value = super(Expires, cls).from_mongo(data, **kw)
		
		if not expired and value.is_expired:
			return None
		
		return value