[C API] Heap types (PyType_FromSpec) must fully implement the GC protocol

BPO | [42972](https://bugs.python.org/issue42972)
--- | :---
Nosy | @nascheme, @ncoghlan, @vstinner, @tiran, @corona10, @pablogsal, @miss-islington, @shihai1991, @erlend-aasland, @Fidget-Spinner
PRs | <li>python/cpython#26104</li><li>python/cpython#26114</li><li>python/cpython#26361</li><li>python/cpython#26362</li><li>python/cpython#26363</li><li>python/cpython#26368</li><li>python/cpython#26370</li><li>python/cpython#26371</li><li>python/cpython#26372</li><li>python/cpython#26373</li><li>python/cpython#26374</li><li>python/cpython#26376</li><li>python/cpython#26381</li><li>python/cpython#26397</li><li>python/cpython#26398</li><li>python/cpython#26399</li><li>python/cpython#26406</li><li>python/cpython#26407</li><li>python/cpython#26411</li><li>python/cpython#26413</li><li>python/cpython#26414</li><li>python/cpython#26423</li><li>python/cpython#26424</li><li>python/cpython#26425</li><li>python/cpython#26426</li><li>python/cpython#26427</li><li>python/cpython#26429</li><li>python/cpython#26430</li><li>python/cpython#26431</li><li>python/cpython#26451</li><li>python/cpython#26452</li><li>python/cpython#26460</li><li>python/cpython#26461</li><li>python/cpython#26475</li><li>python/cpython#26515</li><li>python/cpython#26734</li><li>python/cpython#26735</li>

<sup>*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*</sup>

<details><summary>Show more details</summary><p>

GitHub fields:
```python
assignee = None
closed_at = None
created_at = <Date 2021-01-19.21:54:26.099>
labels = ['expert-C-API', 'type-bug', '3.10']
title = '[C API] Heap types (PyType_FromSpec) must fully implement the GC protocol'
updated_at = <Date 2021-09-29.00:01:08.612>
user = 'https://github.com/vstinner'
```

bugs.python.org fields:
```python
activity = <Date 2021-09-29.00:01:08.612>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['C API']
creation = <Date 2021-01-19.21:54:26.099>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 42972
keywords = ['patch']
message_count = 56.0
messages = ['385297', '385299', '385883', '393547', '393609', '393668', '394383', '394385', '394386', '394388', '394402', '394403', '394404', '394409', '394416', '394427', '394446', '394450', '394516', '394517', '394518', '394519', '394520', '394532', '394541', '394547', '394554', '394555', '394562', '394564', '394566', '394568', '394574', '394575', '394583', '394594', '394601', '394609', '394622', '394643', '394645', '394646', '394647', '394658', '394659', '394662', '394669', '394676', '394789', '394795', '394797', '394801', '394852', '395015', '395878', '395879']
nosy_count = 11.0
nosy_names = ['nascheme', 'ncoghlan', 'vstinner', 'christian.heimes', 'corona10', 'pablogsal', 'miss-islington', 'shihai1991', 'erlendaasland', 'kj', 'soffieswan015']
pr_nums = ['26104', '26114', '26361', '26362', '26363', '26368', '26370', '26371', '26372', '26373', '26374', '26376', '26381', '26397', '26398', '26399', '26406', '26407', '26411', '26413', '26414', '26423', '26424', '26425', '26426', '26427', '26429', '26430', '26431', '26451', '26452', '26460', '26461', '26475', '26515', '26734', '26735']
priority = None
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42972'
versions = ['Python 3.10']
```

</p></details>



### Linked PRs
* gh-127669
* gh-127670

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[C API] Heap types (PyType_FromSpec) must fully implement the GC protocol #87138

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BPO	42972
Nosy	@nascheme, @ncoghlan, @vstinner, @tiran, @corona10, @pablogsal, @miss-islington, @shihai1991, @erlend-aasland, @Fidget-Spinner
PRs	bpo-42972: Fully implement GC protocol for sqlite3 heap types #26104 bpo-42972: Fully implement GC protocol for arraymodule types #26114 [3.10] bpo-42972: Fully implement GC protocol for sqlite3 heap types (GH-26104) #26361 [3.10] bpo-42972: Fully implement GC protocol for arraymodule types (GH-26114) #26362 bpo-42972: Fully implement GC protocol for functools keywrapper and partial types #26363 bpo-42972: Fully implement GC protocol for re types #26368 bpo-42972: Fully implement GC protocol for ssl heap types (GH-26370) #26370 bpo-42972: Fully support GC protocol for operator heap types #26371 bpo-42972: Fully support GC protocol for _queue.SimpleQueue #26372 bpo-42972: Fully support GC for mmap heap types #26373 bpo-42972: Fully support GC for hashlib heap types (GH-26374) #26374 bpo-42972: Fully support GC for pyexpat, unicodedata, and dbm/gdbm heap types #26376 bpo-42972: Fully support GC for _winapi.Overlapped #26381 [3.10] bpo-42972: Fully support GC for pyexpat, unicodedata, and dbm/gdbm heap types (GH-26376) #26397 [3.10] bpo-42972: Fully support GC for hashlib heap types (GH-26374) #26398 [3.10] bpo-42972: Fully implement GC protocol for ssl heap types (GH-26370) #26399 [3.10] bpo-42972: Fully support GC protocol for _queue.SimpleQueue (GH-26372) #26406 [3.10] bpo-42972: Fully support GC for mmap heap types (GH-26373) #26407 [3.10] bpo-42972: Fully implement GC protocol for re types (GH-26368) #26411 [3.10] bpo-42972: Fully support GC protocol for _operator heap types (GH-26371) #26413 [3.10] bpo-42972: Fully implement GC protocol for re types (GH-26368) #26414 bpo-42972: Fully implement GC protocol for functools LRU cache #26423 [3.10] bpo-42972: Fully implement GC protocol for functools keywrapper and partial types (GH-26363) #26424 [3.10] bpo-42972: Fully implement GC protocol for functools LRU cache (GH-26423) #26425 [3.10] bpo-42972: Fully support GC for _winapi.Overlapped (GH-26381) #26426 [3.10] bpo-42972: Fully support GC for _winapi.Overlapped (GH-26381) #26427 bpo-42972: Fix GC assertion error in _winapi by untracking Overlapped earlier #26429 [3.10] bpo-42972: Fully support GC for _winapi.Overlapped (GH-26381) #26430 [3.10] bpo-42972: Fully support GC for _winapi.Overlapped (GH-26381) #26431 bpo-42972: Fully implement GC protocol for xxlimited.Xxo #26451 bpo-42972: Fix sqlite3 traverse/clear #26452 [3.10] bpo-42972: Fully implement GC protocol for xxlimited (GH-26451) #26460 [3.10] bpo-42972: Fix sqlite3 traverse/clear functions (GH-26452) #26461 bpo-42972: Track sqlite3 statement objects #26475 [3.10] bpo-42972: Track sqlite3 statement objects (GH-26475) #26515 bpo-42972: _thread.RLock type implements tp_traverse #26734 [3.10] bpo-42972: _thread.RLock implements the GH protocol (GH-26734) #26735

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[C API] Heap types (PyType_FromSpec) must fully implement the GC protocol #87138

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