[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.

未指定檔案或測試。首先追蹤建立元素子項目和 _owner.alternate 鏈的 React 16 原始碼，然後檢視連結的 react-helmet issue 441。完成的標準是記錄 _owner.alternate 所代表的內容，並確定 enumerable owner 問題是否需要記錄在案的變更。