所以要回答你的问题，你必须假定这是实现定义的行为。

So to answer your question, you must assume this is implementation defined behaviour.

youdao

任何自定义的实现都必须考虑这些行为。

Any custom implementation must consider these behaviors.

youdao

可实现自定义验证程序以获取不同的行为。

A custom validator can be implemented to obtain a different behavior.

youdao

可实现自定义验证程序以获取不同的行为。

A custom validator can be implemented to obtain a different behavior.

youdao