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bpo-34042: Fix dict.copy() to maintain correct total refcount (GH-8119)
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Fix dict.copy() to maintain correct total refcount (as reported by
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sys.gettotalrefcount()).

Objects/dictobject.c

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@@ -656,6 +656,13 @@ clone_combined_dict(PyDictObject *orig)
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/* Maintain tracking. */
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_PyObject_GC_TRACK(new);
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}
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/* Since we copied the keys table we now have an extra reference
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in the system. Manually call _Py_INC_REFTOTAL to signal that
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we have it now; calling DK_INCREF would be an error as
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keys->dk_refcnt is already set to 1 (after memcpy). */
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_Py_INC_REFTOTAL;
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return (PyObject *)new;
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}
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