Description:
------------
When comparing (using == operator) an ARRAY with SplFixedArray object one always 
gets "false", even if arrays are exact match.
However, casting SplFixedArray to (array) beforehand does a correct (as far as 
the == operator goes anyway) comparison.

For convenience it would be good to add a cast_object handler that does the same 
thing that SplFixedArray::toArray function does (returns a PHP ARRAY matching 
the SplFixedArray objects content).

Details:
The == operator uses cast_object handler when comparing ARRAY with SplFixedArray 
object. The SplFixedArray has the default PHP cast_object handler 
(zend_std_cast_object_tostring), which fails to convert SplFixedArray to ARRAY. 
In such case the comparison is always false (not equal).

Adding a custom cast_object handler to SplFixedArray that does the same thing 
that ::toArray function does, would enable a developer to use $splarray == 
$array to perform a comparison, instead of using an explicit cast or calling the 
toArray() function explicitly (see example code below).

Test script:
---------------
<?php
$arr = array(1,2,3);
$splarr = SplFixedArray::fromArray($arr);

var_dump($splarr == $arr); // Not Equal (should be)
var_dump((array)$splarr == $arr); // Equal
var_dump($splarr->toArray() == $arr); // Equal

Expected result:
----------------
bool(true)
bool(true)
bool(true)

Actual result:
--------------
bool(false)
bool(true)
bool(true)