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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Crash `msgspec` with Python 3.13.*","articleBody":"# Bug report\n\n### Bug description:\n\nThe original problem - https://github.com/jcrist/msgspec/pull/960\n\nIn Python 3.13 `PyObject_GC_New` does not do initialization inline values (aka `_PyObject_InitInlineValues`).\nIn Python 3.14 `PyObject_GC_New` does initialization inline values - https://github.com/python/cpython/blob/main/Python/gc.c#L2377-L2379 \n\nAre there any reasons why `PyObject_GC_New` doesn't do this initialization in Python 3.13?\n\nI tried to fix `msgspec` by adding a call to the private function `_PyObject_InitInlineValues`, but this causes other problems.\nCan you tell me how to fix this place more correctly? I just came up with the idea to make a copy of the `_PyObject_InitInlineValues` function in `msgspec` for Python 3.13.\n\n\n\n### CPython versions tested on:\n\n3.13\n\n### Operating systems tested on:\n\nLinux","author":{"url":"https://github.com/shadchin","@type":"Person","name":"shadchin"},"datePublished":"2025-12-13T16:24:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/142671/cpython/issues/142671"}