keeping ref var_hash within recursive serialize() calls

Hi, I prepared a patch [1] which enables serialize() to keep track of object/variable references through its var_hash throughout recursive calls to serialize(). See the test included in the patch respectively bug #45706 [2] what this exactly means. It also has the side affect that the hack [3] in spl_array.c is apparently no longer needed. All serialization tests pass. There should not be any need to change external code (except hack-alike things like those obsoleted in spl_array.c), but ABI compatibility is broken and it's quite an intrusive change to the serialization code, so I start here and not with svn ci ;) Objections, comments? Cheers, Mike [1]http://dev.iworks.at/PATCHES/keep_refs_with_recursive_serialize.txt [2]http://bugs.php.net/45706 [3] http://svn.php.net/viewvc/php/php-src/trunk/ext/spl/spl_array.c?r1=264490&r2=265477