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Fixes #142448 Sorry, there is no test as I can't produce something that is self-isolated. Furthermore, it seems this test only works with exceptions + monitoring, which is exceptionally hard...

Fidget-Spinner

* Issue: gh-142831

ashm-dev

When _weak_cache is a descriptor that creates a new object each time it's accessed, get_weak_cache() incorrectly assumed it could return a borrowed reference and immediately decremented the reference count. This...

fatelei

### What happened? A crafted mapping returns a list from `items` and a key encoder clears that list mid iteration, yet `_encoder_iterate_mapping_lock_held` continues to read entries for `encoder_encode_key_value`, so `_json`...

jackfromeast

This is a reopen PR from #141618 the reason is that I deleted my fork by accident and all my on going PR gone. this is an approved one, really...

yihong0618

# Crash report ### What happened? Please see title. ### CPython versions tested on: CPython main branch ### Operating systems tested on: _No response_ ### Output from running 'python -VV'...

Fidget-Spinner

gh-141594: A free-threaded JIT

6

This PR gives the JIT free-threading support. It is only on for single-threaded code, and turns off automatically on multi-threaded code. All JIT features are turned on, including the optimizer....

Fidget-Spinner

gh-101525: Check whether to skip functions with computed gotos during BOLT runs

5

With LLVM >= 21.1.0 BOLT can handle computed gotos in PIC compiled code. However in some cases computed gotos still produce issues. This PR handles it this way: For either...

stratakis

gh-142419: Add mmap.set_name method for user custom annotation

5

* Issue: gh-142419 ---- 📚 Documentation preview 📚: https://cpython-previews--142480.org.readthedocs.build/

corona10

gh-134584: Remove redundant refcount from _BINARY_OP_ADD_UNICODE

1

* Issue: gh-134584

corona10