Stdio: Stricter handling of zero.

lib/modules/Stdio.pmod/Readline.pike

@@ -439,11 +439,11 @@ class InputController
 {
   private object infd, term;
   private int enabled = -1;
-  private function(:int) close_callback = 0;
+  private function(:int)|zero close_callback = 0;
   private string prefix="";
   private mapping(int:function|mapping(string:function)) bindings=([]);
-  private function grab_binding = 0;
-  private mapping oldattrs = 0;
+  private function|zero grab_binding = 0;
+  private mapping|zero oldattrs = 0;
 
   int dumb=0;
 
@@ -1254,12 +1254,12 @@ class History
 private OutputController output_controller;
 private InputController input_controller;
 private string prompt="";
-private array(string) prompt_attrs=0;
+private array(string)|zero prompt_attrs=0;
 private string text="", readtext;
 private function(string|zero:void) newline_func;
 private int cursorpos = 0;
 private int mark = 0;
-/* private */ History historyobj = 0;
+/* private */ object(History)|zero historyobj = 0;
 private int hide = 0;
 
 private array(string) kill_ring=({});

lib/modules/Stdio.pmod/module.pmod

@@ -629,7 +629,7 @@ class File
   private void _async_check_cb(mixed|void ignored)
   {
     // Copy the args to avoid races.
-    function(int, mixed ...:void) cb = _async_cb;
+    function(int, __unknown__ ...:void) cb = _async_cb;
     array args = _async_args;
     _async_cb = 0;
     _async_args = 0;
@@ -3402,13 +3402,13 @@ protected class nb_sendfile
     }
 
     // Make sure we get rid of any references...
-    to_write = 0;
+    to_write = ({});
     trailers = 0;
     from = 0;
     to = 0;
     backend = 0;
     array(mixed) a = args;
-    function(int, mixed ...:void) cb = callback;
+    function(int, __unknown__ ...:void) cb = callback;
     args = 0;
     callback = 0;
     if (cb) {
@@ -3700,7 +3700,7 @@ class UDP
   inherit _Stdio.UDP;
 
   private array extra=0;
-  private function(mapping,mixed...:void) callback=0;
+  private function(mapping, __unknown__ ...:void) callback=0;
 
   //! @decl UDP set_nonblocking()
   //! @decl UDP set_nonblocking(void|function(mapping(string:int|string), @