Description:
------------
sorry for my bad English. i found bug in enum, just run code, and you`ll see, that on first var_dump variables has correct values

object(CardType)#1 (1) { 
["__default"]=> 
string(5) "table" 
} 
object(CardType)#2 (1) { 
["__default"]=> 
string(4) "list" 
} 

but after assignment operation variable $card_type is broken. Sometimes it return another enum, but i can`t emulate this in short version of code, so just attach small code, which broke variable

object(CardType)#1 (1) { 
["__default"]=> 
UNKNOWN:0 
} 
object(CardType)#2 (1) { 
["__default"]=> 
string(5) "table" 
}

think that happens because of some bugs in work with memory pointers on clone\copy operation

Test script:
---------------
class CardType extends SplEnum 
{ 
const __default = 'list';

const CARD_LIST = 'list'; 
const TABLE = 'table'; 
const TABLE2 = 'table2'; 
}

$card_type = new CardType('table'); 
$card_type2 = new CardType('list'); 
var_dump($card_type, $card_type2);

$card_type2=$card_type;

var_dump($card_type, $card_type2);