Import CPython 3.14.7+ stable branch (2026-08-06)

Summary:
Imported python/cpython `3.14.7+` from upstream rev [`085fd75`](https://www.github.com/python/cpython/commit/085fd75cb2b0b2b16d640020835545b9988e63fb) (committed 2026-08-06 15:18:32+00:00).

# Commit Info

- Base: (`3.14.6+`) - [`1f574b1`](https://www.github.com/python/cpython/commit/1f574b1ce58067f9fdaad0b5ff9a3bfb87151e4c) (commit date: 2026-08-03 21:14:27+00:00)
- Imported: (`3.14.7+`) - [`085fd75`](https://www.github.com/python/cpython/commit/085fd75cb2b0b2b16d640020835545b9988e63fb) (commit date: 2026-08-06 15:18:32+00:00)

# Noteworthy file changes

- Stdlib files (1 added, 1 removed)
- Low-signal files (4 added, 211 removed) (NEWS.d, docs, .github)

Complete list of added/removed files: https://www.internalfb.com/intern/everpaste/?color=0&handle=GA1mfCcS9fJowcUDAGWPU_d-37wzbr0LAAAz

Reviewed By: itamaro

Differential Revision: D115117124

fbshipit-source-id: 0fc3e0da6c62854aef7e30688a34ddd9ea5c2612

Author: generatedunixname1734921407115435

cinderx/Interpreter/3.14/Includes/generated_cases.c.h

@@ -12534,8 +12534,21 @@
             _PyStackRef v;
             v = stack_pointer[-1];
             set = stack_pointer[-2 - (oparg-1)];
+            PyObject *set_o = PyStackRef_AsPyObjectBorrow(set);
+            if (!PySet_CheckExact(set_o)) {
+                _PyFrame_SetStackPointer(frame, stack_pointer);
+                _PyErr_Format(tstate, PyExc_TypeError,
+                              "'%T' object is not a set", set_o);
+                stack_pointer = _PyFrame_GetStackPointer(frame);
+                stack_pointer += -1;
+                assert(WITHIN_STACK_BOUNDS());
+                _PyFrame_SetStackPointer(frame, stack_pointer);
+                PyStackRef_CLOSE(v);
+                stack_pointer = _PyFrame_GetStackPointer(frame);
+                JUMP_TO_LABEL(error);
+            }
             _PyFrame_SetStackPointer(frame, stack_pointer);
-            int err = _PySet_AddTakeRef((PySetObject *)PyStackRef_AsPyObjectBorrow(set),
+            int err = _PySet_AddTakeRef((PySetObject *)set_o,
                                         PyStackRef_AsPyObjectSteal(v));
             stack_pointer = _PyFrame_GetStackPointer(frame);
             if (err) {