Description:
------------
array_splice don't works with Closures.

Test script:
---------------
<?php
$items = array( 'to remove' , 'item' );

var_dump( phpversion() );

array_splice( $items , 0 , 1 , 'works with strings' );
var_dump( $items );

array_splice( $items , 0 , 1 , 10 ); //with numbers
var_dump( $items );

array_splice( $items , 0 , 1 , true ); //with booleans
var_dump( $items );

array_splice( $items , 0 , 1 , array( 'it\'s' , 'ok' ) ); //with arrays
var_dump( $items );

$items = array( 'to remove' , 'item' );
$func = function(){ return 'just a test'; };

array_splice( $items , 0 , 1 , $func ); //but not with Closures
var_dump( $items );

Expected result:
----------------
string(5) "5.3.0"
array(2) {
  [0]=>
  string(18) "works with strings"
  [1]=>
  string(4) "item"
}
array(2) {
  [0]=>
  int(10)
  [1]=>
  string(4) "item"
}
array(2) {
  [0]=>
  bool(true)
  [1]=>
  string(4) "item"
}
array(3) {
  [0]=>
  string(4) "it's"
  [1]=>
  string(2) "ok"
  [2]=>
  string(4) "item"
}
array(2) {
  [0]=>
  object(Closure)#2 (0) {
  }
  [1]=>
  string(4) "item"
}

Actual result:
--------------
PHP 5.3.0:

string(5) "5.3.0"
array(2) {
  [0]=>
  string(18) "works with strings"
  [1]=>
  string(4) "item"
}
array(2) {
  [0]=>
  int(10)
  [1]=>
  string(4) "item"
}
array(2) {
  [0]=>
  bool(true)
  [1]=>
  string(4) "item"
}
array(3) {
  [0]=>
  string(4) "it's"
  [1]=>
  string(2) "ok"
  [2]=>
  string(4) "item"
}
array(1) {
  [0]=>
  string(4) "item"
}
--------------------------------------------

PHP 5.3.2

string(5) "5.3.2"
array(2) {
  [0]=>
  string(18) "works with strings"
  [1]=>
  string(4) "item"
}
array(2) {
  [0]=>
  int(10)
  [1]=>
  string(4) "item"
}
array(2) {
  [0]=>
  bool(true)
  [1]=>
  string(4) "item"
}
array(3) {
  [0]=>
  string(4) "it's"
  [1]=>
  string(2) "ok"
  [2]=>
  string(4) "item"
}
array(1) {
  [0]=>
  string(4) "item"
}
--------------------------------------------

PHP 5.3.3-dev

string(9) "5.3.3-dev"
array(2) {
  [0]=>
  string(18) "works with strings"
  [1]=>
  string(4) "item"
}
array(2) {
  [0]=>
  int(10)
  [1]=>
  string(4) "item"
}
array(2) {
  [0]=>
  bool(true)
  [1]=>
  string(4) "item"
}
array(3) {
  [0]=>
  string(4) "it's"
  [1]=>
  string(2) "ok"
  [2]=>
  string(4) "item"
}
array(1) {
  [0]=>
  string(4) "item"
}