[Question] about "._owner.alternate"

It seems that in react@16 every React element children contains cyclic property ._owner.alternate.alternate.alternate.alternate....

So it is easy to cause "Maximum call stack exceeded" error when developer compares props.children in deep way(like deep-equal).

This caused bugs for community libraries like react-helmet:
https://github.com/nfl/react-helmet/issues/441

I am extremely curious about:
Why React has _owner.alternate, and what it stands for?
As it is named as “_owner”, could it be better if we make “owner” not enumerable?

I tried to search source code and but still can’t find any clue.

Thanks in advance.

Aucun fichier ni test n’est nommé. Commencez par suivre le code source de React 16 qui crée les enfants des éléments et la chaîne _owner.alternate, puis examinez le react-helmet issue 441 lié. Le travail est terminé lorsque la signification de _owner.alternate est documentée et qu’il est déterminé si la question de l’owner enumerable nécessite une modification documentée.