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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Check that new heap types cannot be created uninitialised: add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag","articleBody":"BPO | [43916](https://bugs.python.org/issue43916)\n--- | :---\nNosy | @vstinner, @tiran, @serhiy-storchaka, @pablogsal, @miss-islington, @erlend-aasland, @shreyanavigyan\nPRs | \u003cli\u003epython/cpython#25653\u003c/li\u003e\u003cli\u003epython/cpython#25721\u003c/li\u003e\u003cli\u003epython/cpython#25722\u003c/li\u003e\u003cli\u003epython/cpython#25733\u003c/li\u003e\u003cli\u003epython/cpython#25745\u003c/li\u003e\u003cli\u003epython/cpython#25748\u003c/li\u003e\u003cli\u003epython/cpython#25749\u003c/li\u003e\u003cli\u003epython/cpython#25750\u003c/li\u003e\u003cli\u003epython/cpython#25751\u003c/li\u003e\u003cli\u003epython/cpython#25753\u003c/li\u003e\u003cli\u003epython/cpython#25768\u003c/li\u003e\u003cli\u003epython/cpython#25791\u003c/li\u003e\u003cli\u003epython/cpython#25854\u003c/li\u003e\u003cli\u003epython/cpython#26412\u003c/li\u003e\u003cli\u003epython/cpython#26888\u003c/li\u003e\nFiles | \u003cli\u003e[patch.diff](https://bugs.python.org/file49989/patch.diff \"Uploaded as text/plain at 2021-04-26.22:13:02 by @erlend-aasland\")\u003c/li\u003e\u003cli\u003e[disablednew.diff](https://bugs.python.org/file49992/disablednew.diff \"Uploaded as text/plain at 2021-04-27.08:23:03 by @erlend-aasland\")\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = None\ncreated_at = \u003cDate 2021-04-22.21:31:58.958\u003e\nlabels = ['expert-C-API', 'type-bug', '3.9']\ntitle = 'Check that new heap types cannot be created uninitialised: add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag'\nupdated_at = \u003cDate 2022-01-27.13:51:31.586\u003e\nuser = 'https://github.com/pablogsal'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2022-01-27.13:51:31.586\u003e\nactor = 'vstinner'\nassignee = 'none'\nclosed = False\nclosed_date = None\ncloser = None\ncomponents = ['C API']\ncreation = \u003cDate 2021-04-22.21:31:58.958\u003e\ncreator = 'pablogsal'\ndependencies = []\nfiles = ['49989', '49992']\nhgrepos = []\nissue_num = 43916\nkeywords = ['patch']\nmessage_count = 72.0\nmessages = ['391634', '391635', '391903', '391905', '391909', '391910', '391911', '391912', '391913', '391917', '391924', '391925', '391926', '391928', '391929', '391931', '391934', '391936', '391937', '391984', '391992', '391999', '392036', '392040', '392042', '392044', '392046', '392048', '392057', '392169', '392170', '392297', '392414', '392426', '392427', '392433', '392434', '392435', '392437', '392438', '392451', '392456', '392462', '392464', '392465', '392472', '392473', '392526', '392528', '392534', '392537', '392545', '392546', '392553', '392554', '392556', '392558', '392570', '392621', '392632', '392635', '392811', '394571', '394582', '394603', '396200', '396476', '411785', '411786', '411865', '411867', '411874']\nnosy_count = 7.0\nnosy_names = ['vstinner', 'christian.heimes', 'serhiy.storchaka', 'pablogsal', 'miss-islington', 'erlendaasland', 'shreyanavigyan']\npr_nums = ['25653', '25721', '25722', '25733', '25745', '25748', '25749', '25750', '25751', '25753', '25768', '25791', '25854', '26412', '26888']\npriority = None\nresolution = None\nstage = 'patch review'\nstatus = 'open'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue43916'\nversions = ['Python 3.9']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/pablogsal","@type":"Person","name":"pablogsal"},"datePublished":"2021-04-22T21:31:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":74},"url":"https://github.com/88082/cpython/issues/88082"}