gh-150868: Fix sum() deallocating a float subclass as an exact float#151063
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eendebakpt wants to merge 1 commit into
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gh-150868: Fix sum() deallocating a float subclass as an exact float#151063eendebakpt wants to merge 1 commit into
eendebakpt wants to merge 1 commit into
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…float The complex-total fast path in builtin_sum_impl() guarded with PyFloat_Check() (which accepts subclasses) but freed the item with _Py_DECREF_SPECIALIZED(item, _PyFloat_ExactDealloc), which assumes an exact float. A float subclass instance reaching refcount 0 in that loop aborts on an assertion in debug builds, and in release builds skips the subclass tp_dealloc (type refcount leak, __del__ never runs, subclass object pushed onto the float freelist). Use PyFloat_CheckExact() instead, matching the float-total branch, so subclass instances fall through to the generic PyNumber_Add() path. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
StanFromIreland
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There was already a PR opened earlier, lets give that a chance to be merged. |
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