Issue #13411: memoryview objects are now hashable when the underlying object is hashable.
diff --git a/Include/memoryobject.h b/Include/memoryobject.h
index 62ecbd6..aff5d99 100644
--- a/Include/memoryobject.h
+++ b/Include/memoryobject.h
@@ -69,6 +69,7 @@
 typedef struct {
     PyObject_HEAD
     Py_buffer view;
+    Py_hash_t hash;
 } PyMemoryViewObject;
 #endif