Description:
------------
The rules for property names are inconsistent.
See comments in submitted code.


Reproduce code:
---------------
<?
  // this is ok  
  $a->{"x"} = 1;

  // fatal error:
  $a->{18.5} = 1;

  // fatal error:
  $a->{1} = 1;

  // but this one passes thru:
  $a->{true} = 1;

  // so do this:
  $a->{18.5} = 1;

  // and this too:
  $a->{1} = 1;
?>

Expected result:
----------------
Either convert floats, integers and booleans to strings automatically or report fatal error in all cases when property name is not a string (i.e. if it is object, array, resource, boolean, integer, float, NULL).


Actual result:
--------------
Fatal error: Property name must be a string ...