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-rw-r--r--Objects/abstract.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/Objects/abstract.c b/Objects/abstract.c
index 37f7eea..3609948 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -1235,7 +1235,11 @@ PySequence_Tuple(PyObject *v)
return null_error();
/* Special-case the common tuple and list cases, for efficiency. */
- if (PyTuple_Check(v)) {
+ if (PyTuple_CheckExact(v)) {
+ /* Note that we can't know whether it's safe to return
+ a tuple *subclass* instance as-is, hence the restriction
+ to exact tuples here. In contrasts, lists always make
+ a copy, so there's need for exactness below. */
Py_INCREF(v);
return v;
}