Feature or enhancement

Proposal:

PEP-661 has not been accepted (python/steering-council#258), but I hope to still get it in for 3.15, and in view of the short time window available I'd like to already submit a PR so those interested can review the implementation already while the SC deliberates.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-148829: Implement PEP 661 #148831
• gh-148829: bump number of static types #149121
• gh-148829: Move sentinelobject.h to Include/cpython/ #149186
• gh-148829: Make sentinels' repr and module customizable #149654
• gh-148829: Add PySentinel_CheckExact() #149725
• [3.15] gh-148829: Add PySentinel_CheckExact() (GH-149725) #149766
• [3.15] gh-148829: Make sentinels' repr and module customizable (GH-149654) #150092