A better JSON check_circular

Feature or enhancement

Proposal:

json.dump(check_circular=True) uses a dictionary to track all objects already visited and creates keys with PyLong_FromVoidPtr. There is another solution for recursive container types in CPython already: Py_ReprEnter and Py_ReprLeave.

I have a patch to replace the dictionary and custom object tracking with the CPython functions and that removes some code and also avoids allocating Long objects for each recursive call.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-137104
• gh-137286

まず json.dump(check_circular=True) と既存の Py_ReprEnter/Py_ReprLeave メカニズムを確認し、次に関連付けられた PR gh-137104 と gh-137286 を調査します。提案された追跡方法が再帰的なコンテナの動作を維持しつつ、辞書と呼び出しごとの PyLong_FromVoidPtr の allocations を除去できれば完了です。