make zlib.Decompress immutable

picnixz · picnixz · commit 2b0f8efaa337 · 2025-09-06T15:20:09.000+02:00
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
@@ -2063,6 +2063,7 @@ static PyType_Spec Decomptype_spec = {
     .flags = (
         Py_TPFLAGS_DEFAULT
         | Py_TPFLAGS_DISALLOW_INSTANTIATION
+        | Py_TPFLAGS_IMMUTABLETYPE
         | Py_TPFLAGS_HAVE_GC
     ),
     .slots = Decomptype_slots,
