Description:
------------
Here is an example from ZendEngine-2.0.pdf (from zend.com):

An example of the new functionality:
$str1 = $str2 = ??;
$str1{0} = ?a?;
$str2[0] = ?a?;
The result will be $str1 being the string ?a?

But we still get array, just as for [].

Reproduce code:
---------------
$str1 = "";
$str1{0} = 'a';
var_dump($str1);


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

Actual result:
--------------
array(1) {
  [0]=>
  string(1) "a"
}