docs: def filtany(entities, **kw):
    """Filter a set of entities based on method return. Use keyword arguments.
    
    Example:
      filtmeth(entities, id='123')
      filtmeth(entities, name='bart')
  
    Multiple filters are 'OR'.
    """
    ret = set()
    for k,v in kw.items():
      for entity in entities:
        if getattr(entity, k)() == v:
          ret.add(entity)
    return ret