Allow access to any ACL members that was equal to the user name.

        That is, some user u is considered a member of group u and no other.

def allow(self, ctx, acls):
        '''Allow access to any ACL members that was equal to the user name.

        That is, some user u is considered a member of group u and no other.
        '''
        for acl in acls:
            if self._identity == acl:
                return True
        return False