commit 3023ebb43f7607584c3e123aff56e867cb04a418
author Serhiy Storchaka <storchaka@gmail.com> Fri Jan 13 08:34:34 2017 +0200
committer Serhiy Storchaka <storchaka@gmail.com> Fri Jan 13 08:34:34 2017 +0200
tree a3489712ed3292964f67b22cbeafbeefcbed902f
parent cb19aeb5500074a954a68dd54c7c3648b0887f08

Py_SIZE() was misused for dict.

Modules/_json.c

diff --git a/Modules/_json.c b/Modules/_json.c
index 47c9b0d..8cbf2e4 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -1609,7 +1609,7 @@
         if (open_dict == NULL || close_dict == NULL || empty_dict == NULL)
             return -1;
     }
-    if (Py_SIZE(dct) == 0)
+    if (PyDict_Size(dct) == 0)  /* Fast path */
         return _PyAccu_Accumulate(acc, empty_dict);
 
     if (s->markers != Py_None) {