patch 7.4.1638
Problem:    When binding a function to a dict the reference count is wrong.
Solution:   Decrement dict reference count, only reference the function when
            actually making a copy. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index c9f1926..1a02fbe 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1638,
+/**/
     1637,
 /**/
     1636,