…lots1* origin/master: (80 commits)  bpo-42282: Fold constants inside named expressions (pythonGH-23190)  bpo-41028: Doc: Move switchers to docsbuild-scripts. (pythonGH-20969)  bpo-42133: update parts of the stdlib to fall back to `__spec__.loader` when `__loader__` is missing (python#22929)  Remove outdated reference to pywin32 from platform module (pythonGH-22005)  bpo-41832: PyType_FromModuleAndSpec() now accepts NULL tp_doc (pythonGH-23123)  Minor grammar edits for the descriptor howto guide (GH-python#23175)  bpo-42179: Doc/tutorial: Remove mention of __cause__ (pythonGH-23162)  bpo-26389: Allow passing an exception object in the traceback module (pythonGH-22610)  bpo-42260: PyConfig_Read() only parses argv once (pythonGH-23168)  bpo-42260: Add _PyConfig_FromDict() (pythonGH-23167)  bpo-41877 Check for asert, aseert, assrt in mocks (pythonGH-23165)  [docs] fix wrongly named AsyncContextDecorator (pythonGH-23164)  bpo-42262: Add Py_NewRef() and Py_XNewRef() (pythonGH-23152)  bpo-42266: Handle monkey-patching descriptors in LOAD_ATTR cache (pythonGH-23157)  bpo-40816 Add AsyncContextDecorator class (pythonGH-20516)  bpo-42260: Add _PyInterpreterState_SetConfig() (pythonGH-23158)  Disable peg generator tests when building with PGO (pythonGH-23141)  bpo-1635741: _sqlite3 uses PyModule_AddObjectRef() (pythonGH-23148)  bpo-1635741: Fix PyInit_pyexpat() error handling (pythonGH-22489)  bpo-42260: Main init modify sys.flags in-place (pythonGH-23150)  ...

…r` when `__loader__` is missing (python#22929)