Description:
------------
Classes implementig OuterIterator don't point to the first
element just after instanciation, unlike the other Iterators.

I'm sure this is the same problem that authors of the following bug reports are talking about 
http://bugs.php.net/bug.php?id=36132 (bogus)
http://bugs.php.net/bug.php?id=44063 (bogus)
http://bugs.php.net/bug.php?id=47497 (bogus)
http://bugs.php.net/bug.php?id=46227 (assigned but nothing appends)

The implementations in .inc from ext\spl\internal works as expected... but not the actual C code!

Reproduce code:
---------------
$a = new ArrayIterator(range('a','z'));
var_dump($a->current());
$ii = new IteratorIterator($a);
var_dump($ii->current());
$ca = new CachingIterator($a);
var_dump($ca->current());
$ai = new AppendIterator($a);
var_dump($ai->current());
$ni = new InfiniteIterator($a);
var_dump($ni->current());
$li = new LimitIterator($a);
var_dump($li->current());

Expected result:
----------------
string(1) "a"
string(1) "a"
string(1) "a"
string(1) "a"
string(1) "a"
string(1) "a"


Actual result:
--------------
string(1) "a"
NULL
NULL
NULL
NULL
NULL