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gh-132331: Addtp_versions_used toPyTypeObject docs#132335

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sonnyding1 wants to merge3 commits intopython:main
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13 changes: 13 additions & 0 deletionsDoc/c-api/typeobj.rst
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Original file line numberDiff line numberDiff line change
Expand Up@@ -149,6 +149,8 @@ Quick Reference
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
| [:c:member:`~PyTypeObject.tp_watched`] | unsigned char | | | | | |
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
| [:c:member:`~PyTypeObject.tp_versions_used`] | uint16_t | | | | | |
+------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+

.. [#slots]

Expand DownExpand Up@@ -2229,6 +2231,17 @@ and :c:data:`PyType_Type` effectively act as defaults.)
.. versionadded:: 3.12


.. c:member:: uint16_t PyTypeObject.tp_versions_used

Internal. Do not use.

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Why should we document something, just to tell people not to use it?

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This field is exposed to the user who may use local PyTypeObject instances that are statically initialized (the LinuxCNC project implements that use case several places). If you do not initialize this field, then you get a warningmissing initializer for member '_typeobject::tp_versions_used'.

Therefore, it should be documented (and it needs to be set to zero when statically initialized).

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**Inheritance:**

This field is not inherited.

.. versionadded:: 3.13


.. _static-types:

Static Types
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