Add freelist for compact int objects

[eendebakpt]

Feature or enhancement

Proposal:

By adding a freelist for compact int objects we can improve performance. More details in the draft PR.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-126868: Add freelist for compact int objects #126865
• gh-126868: Add freelist for compact ints to _PyLong_New #128181