commit 5c4064e8bd199d70eefd7ec24766957c22f1b8e8
author Serhiy Storchaka <storchaka@gmail.com> Sat Dec 19 20:05:25 2015 +0200
committer Serhiy Storchaka <storchaka@gmail.com> Sat Dec 19 20:05:25 2015 +0200
tree a38d9933d5ee0d72fbebba31f046686e678a2c3c
parent efd7b34d7c4e401bbecb343da7c9506137a3b2fe

Issue #25421: __sizeof__ methods of builtin types now use dynamic basic size.
This allows sys.getsize() to work correctly with their subclasses with
__slots__ defined.

Modules/_decimal/_decimal.c

diff --git a/Modules/_decimal/_decimal.c b/Modules/_decimal/_decimal.c
index 169914c..112b44f 100644
--- a/Modules/_decimal/_decimal.c
+++ b/Modules/_decimal/_decimal.c
@@ -4529,7 +4529,7 @@
 {
     Py_ssize_t res;
 
-    res = sizeof(PyDecObject);
+    res = _PyObject_SIZE(Py_TYPE(v));
     if (mpd_isdynamic_data(MPD(v))) {
         res += MPD(v)->alloc * sizeof(mpd_uint_t);
     }