diff --git a/src/evalfunc.c b/src/evalfunc.c
index 86e5d2f..ce51fc0 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -566,9 +566,11 @@
 		t_func_exp.tt_argcount = -1;
 	    else
 	    {
-		if (context->arg_types[0].type_decl->tt_type == VAR_LIST)
+		if (context->arg_types[0].type_curr->tt_type == VAR_STRING
+			|| context->arg_types[0].type_curr->tt_type == VAR_BLOB
+			|| context->arg_types[0].type_curr->tt_type == VAR_LIST)
 		    args[0] = &t_number;
-		else if (context->arg_types[0].type_decl->tt_type == VAR_DICT)
+		else if (context->arg_types[0].type_curr->tt_type == VAR_DICT)
 		    args[0] = &t_string;
 		if (args[0] != NULL)
 		    args[1] = expected_ret;
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index f967e6e..36a7386 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -3457,7 +3457,8 @@
 	char_u *pskip = skip_option_env_lead(eap->cmd);
 
 	if (vim_strchr((char_u *)"{('[\"@&$", *p) != NULL
-	       || ((p = to_name_const_end(pskip)) > eap->cmd && *p != NUL))
+	       || ((p = to_name_const_end(pskip)) > eap->cmd && *p != NUL)
+	       || (p[0] == '0' && p[1] == 'z'))
 	{
 	    int	    oplen;
 	    int	    heredoc;
@@ -3503,6 +3504,8 @@
 			    // "'string'->func()" is an expression.
 			 || *eap->cmd == '\''
 			    // '"string"->func()' is an expression.
+			 || (eap->cmd[0] == '0' && eap->cmd[1] == 'z')
+			    // '"string"->func()' is an expression.
 			 || *eap->cmd == '"'
 			    // "g:varname" is an expression.
 			 || eap->cmd[1] == ':'
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index 882c181..41060e1 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -2360,13 +2360,33 @@
   v9.CheckDefAndScriptFailure(['maparg("a", "b", true, 2)'], ['E1013: Argument 4: type mismatch, expected bool but got number', 'E1212: Bool required for argument 4'])
   maparg('')->assert_equal('')
 
+  # value argument type is checked at compile time
   var lines =<< trim END
       var l = [123]
-      l->map((_, v: string) => 0)
+      l->map((i: number, v: string) => 0)
   END
-  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(any, string): number')
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, string): number')
 
   lines =<< trim END
+      var d = {a: 123}
+      d->map((i: string, v: string) => 0)
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?string, ?number): number but got func(string, string): number')
+
+  lines =<< trim END
+    var s = 'abc'
+    s->map((i: number, v: number) => 'x')
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?string): string but got func(number, number): string')
+
+  lines =<< trim END
+    var s = 0z1122
+    s->map((i: number, v: string) => 0)
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(number, string): number')
+
+  # index argument type is checked at compile time
+  lines =<< trim END
       ['x']->map((i: string, v: string) => 'y')
   END
   v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?any): any but got func(string, string): string')
@@ -2375,6 +2395,16 @@
     {a: 1}->map((i: number, v: number) => 0)
   END
   v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?string, ?any): any but got func(number, number): number')
+
+  lines =<< trim END
+    'abc'->map((i: string, v: string) => 'x')
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?string): string but got func(string, string): string')
+
+  lines =<< trim END
+    0z1122->map((i: string, v: number) => 0)
+  END
+  v9.CheckDefFailure(lines, 'E1013: Argument 2: type mismatch, expected func(?number, ?number): number but got func(string, number): number')
 enddef
 
 def Test_maparg_mapset()
diff --git a/src/version.c b/src/version.c
index 1fdf4e4..6c5ca2b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4426,
+/**/
     4425,
 /**/
     4424,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 74dc5e0..803f19c 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -2818,13 +2818,16 @@
 	/*
 	 * COMMAND after range
 	 * 'text'->func() should not be confused with 'a mark
+	 * 0z1234->func() should not be confused with a zero line number
 	 * "++nr" and "--nr" are eval commands
 	 * in "$ENV->func()" the "$" is not a range
 	 */
 	cmd = ea.cmd;
 	if ((*cmd != '$' || starts_with_colon)
-		&& (starts_with_colon || !(*cmd == '\''
-		       || (cmd[0] != NUL && cmd[0] == cmd[1]
+		&& (starts_with_colon
+		    || !(*cmd == '\''
+			|| (cmd[0] == '0' && cmd[1] == 'z')
+			|| (cmd[0] != NUL && cmd[0] == cmd[1]
 					    && (*cmd == '+' || *cmd == '-')))))
 	{
 	    ea.cmd = skip_range(ea.cmd, TRUE, NULL);