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-137103: A better circular check for json.dump() #137104