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Title: gh-95245: Document Py_TPFLAGS_PREHEADER by sergey-miryanov · Pull Request #135861 · python/cpython · GitHub

Open Graph Title: gh-95245: Document Py_TPFLAGS_PREHEADER by sergey-miryanov · Pull Request #135861 · python/cpython

X Title: gh-95245: Document Py_TPFLAGS_PREHEADER by sergey-miryanov · Pull Request #135861 · python/cpython

Description: I see following usages of Py_TPFLAGS_PREHEADER: Calculate size of preheader (but preheader also contains GC info) Check if types are support managed dict or managed weakref I checked all linked PR from #95245 and can't find any explanation. I also checked https://github.com/python/cpython/blob/main/Objects/object_layout.md. @encukou Please take a look. Issue: gh-95245

Open Graph Description: I see following usages of Py_TPFLAGS_PREHEADER: Calculate size of preheader (but preheader also contains GC info) Check if types are support managed dict or managed weakref I checked all linked P...

X Description: I see following usages of Py_TPFLAGS_PREHEADER: Calculate size of preheader (but preheader also contains GC info) Check if types are support managed dict or managed weakref I checked all linked P...

Opengraph URL: https://github.com/python/cpython/pull/135861

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Show all changes 10 commits https://github.com/python/cpython/pull/135861/files
0eb59b3 Add comemnt for Py_TPFLAGS_PREHEADER sergey-miryanov Jun 23, 2025 https://github.com/python/cpython/pull/135861/commits/0eb59b3c62e9b1c2776ac387943eff0bb09d4271
3195c33 Add Py_TPFLAGS_PREHEADER to typeobj.rst sergey-miryanov Jun 24, 2025 https://github.com/python/cpython/pull/135861/commits/3195c3333907c3d1f0031f255558d7938f925192
6b37dcf Add news sergey-miryanov Jun 24, 2025 https://github.com/python/cpython/pull/135861/commits/6b37dcf8d0a34f48edcad1c2bfcd014d46939823
fc7fb85 Fix news entry sergey-miryanov Jun 24, 2025 https://github.com/python/cpython/pull/135861/commits/fc7fb8553d21c6f8eed487e4cae001f900fd3031
2062b3d Update Doc/c-api/typeobj.rst sergey-miryanov Jul 7, 2025 https://github.com/python/cpython/pull/135861/commits/2062b3d3461a01e170f4b4f1356a545e4a5c3fce
fd1f311 Delete news entry sergey-miryanov Jul 7, 2025 https://github.com/python/cpython/pull/135861/commits/fd1f31144103bb2a769d60f59b2a6d8cf91b5630
0c8436b Update Doc/c-api/typeobj.rst sergey-miryanov Aug 22, 2025 https://github.com/python/cpython/pull/135861/commits/0c8436b5a10d6088543b46d1094d37a3b35d4a2c
e788241 Apply suggestions from review sergey-miryanov Aug 22, 2025 https://github.com/python/cpython/pull/135861/commits/e788241fd7a573fc38933977f14c55a3d5cde1e3
7595c18 Merge branch 'main' into gh-135755-document-preheader-flag sergey-miryanov Aug 22, 2025 https://github.com/python/cpython/pull/135861/commits/7595c1859843c3c9616ce61b13d8b1ff4904c14f
8134bc8 Update Doc/c-api/typeobj.rst sergey-miryanov Aug 22, 2025 https://github.com/python/cpython/pull/135861/commits/8134bc8acbdadf43e50a15d6e23f0bc8fff77990
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