…exit}__` (python#118812)These methods are purely wrappers around `Semlock.{acquire,release}`,which expect a critical section to be held.

…s for ACLs. (pythonGH-118800)

…ject.c` (python#118850)

…ld (python#118723)The `list_preallocate_exact` function did not zero initialize arraycontents. In the free-threaded build, this could expose uninitializedmemory to concurrent readers between the call to`list_preallocate_exact` and the filling of the array contents withitems.

…t file (python#118808)Some embedders and extensions include parts of the internal API. Thepycore_mimalloc.h file is transitively include by a number of otherinternal headers. This avoids include errors for code that wasalready including those headers.

Avoid immortalizing objects in tests that verify garbage collection ofclasses or modules.This fixes test_ordered_dict and test_struct.

…ython#118722)Using `race:` filters out warnings if the function appears anywhere inthe stack trace. This can hide a lot of unrelated warnings, especiallyfor a function like `_PyEval_EvalFrameDefault`, which is somewhere onthe stack more often than not.Change all free-threaded suppressions to `race_top:`, which only matchesthe top frame, and add any new suppressions this exposes.

…ython#118854)Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

…NULL object (python#115433)" (python#118861)This reverts commitad4f909.The API ended up not being used.

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