diff --git a/src/edit.c b/src/edit.c
index 68b8968..1c61433 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -3959,7 +3959,7 @@
     curbuf_save = curbuf;
 
     /* Call a function, which returns a list or dict. */
-    if (call_vim_function(funcname, 2, args, FALSE, &rettv) == OK)
+    if (call_vim_function(funcname, 2, args, FALSE, FALSE, &rettv) == OK)
     {
 	switch (rettv.v_type)
 	{
diff --git a/src/eval.c b/src/eval.c
index b83334c..b04f330 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1564,11 +1564,12 @@
  * Returns OK or FAIL.
  */
     int
-call_vim_function(func, argc, argv, safe, rettv)
+call_vim_function(func, argc, argv, safe, str_arg_only, rettv)
     char_u      *func;
     int		argc;
     char_u      **argv;
     int		safe;		/* use the sandbox */
+    int		str_arg_only;	/* all arguments are strings */
     typval_T	*rettv;
 {
     typval_T	*argvars;
@@ -1593,8 +1594,11 @@
 	    continue;
 	}
 
-	/* Recognize a number argument, the others must be strings. */
-	vim_str2nr(argv[i], NULL, &len, TRUE, TRUE, &n, NULL);
+	if (str_arg_only)
+	    len = 0;
+	else
+	    /* Recognize a number argument, the others must be strings. */
+	    vim_str2nr(argv[i], NULL, &len, TRUE, TRUE, &n, NULL);
 	if (len != 0 && len == (int)STRLEN(argv[i]))
 	{
 	    argvars[i].v_type = VAR_NUMBER;
@@ -1646,7 +1650,8 @@
     typval_T	rettv;
     char_u	*retval;
 
-    if (call_vim_function(func, argc, argv, safe, &rettv) == FAIL)
+    /* All arguments are passed as strings, no conversion to number. */
+    if (call_vim_function(func, argc, argv, safe, TRUE, &rettv) == FAIL)
 	return NULL;
 
     retval = vim_strsave(get_tv_string(&rettv));
@@ -1671,7 +1676,8 @@
     typval_T	rettv;
     long	retval;
 
-    if (call_vim_function(func, argc, argv, safe, &rettv) == FAIL)
+    /* All arguments are passed as strings, no conversion to number. */
+    if (call_vim_function(func, argc, argv, safe, TRUE, &rettv) == FAIL)
 	return -1;
 
     retval = get_tv_number_chk(&rettv, NULL);
@@ -1694,7 +1700,8 @@
 {
     typval_T	rettv;
 
-    if (call_vim_function(func, argc, argv, safe, &rettv) == FAIL)
+    /* All arguments are passed as strings, no conversion to number. */
+    if (call_vim_function(func, argc, argv, safe, TRUE, &rettv) == FAIL)
 	return NULL;
 
     if (rettv.v_type != VAR_LIST)
diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index 63c140c..a102598 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -23,7 +23,7 @@
 list_T *eval_spell_expr __ARGS((char_u *badword, char_u *expr));
 int get_spellword __ARGS((list_T *list, char_u **pp));
 typval_T *eval_expr __ARGS((char_u *arg, char_u **nextcmd));
-int call_vim_function __ARGS((char_u *func, int argc, char_u **argv, int safe, typval_T *rettv));
+int call_vim_function __ARGS((char_u *func, int argc, char_u **argv, int safe, int str_arg_only, typval_T *rettv));
 void *call_func_retstr __ARGS((char_u *func, int argc, char_u **argv, int safe));
 long call_func_retnr __ARGS((char_u *func, int argc, char_u **argv, int safe));
 void *call_func_retlist __ARGS((char_u *func, int argc, char_u **argv, int safe));
diff --git a/src/version.c b/src/version.c
index 15da1d8..3a662a2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    614,
+/**/
     613,
 /**/
     612,