patch 7.4.1644
Problem:    Using string() on a partial that exists in the dictionary it binds
            results in an error. (Nikolai Pavlov)
Solution:   Make string() not fail on a recursively nested structure. (Ken
            Takta)
diff --git a/src/version.c b/src/version.c
index 4cd93d2..b90a0d0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1644,
+/**/
     1643,
 /**/
     1642,