Description:
------------
If a class function returns a class constant or true and the result is checked with a switch, the switch does not enter the correct block.
I expect $bResult should be converted to 1 if it is "true" but not to -1.

Reproduce code:
---------------
<?php
class Foo {
   const ERR_ONE = -1;
   
   public function bar() {
      return true;
   }
   
   public function isErr() {
      return self::ERR_ONE;
   }
}
$oFoo = new Foo();
$bResult = $oFoo->bar();
switch ($bResult) {
   case Foo::ERR_ONE:
      "ERR_ONE: " . var_dump($bResult);      
   break;  
   default:
      echo "default";
   break; 
}

$bResult = $oFoo->isErr();
switch ($bResult) {
   case Foo::ERR_ONE:
      "ERR_ONE: " . var_dump($bResult);      
   break;  
   default:
      echo "default";
   break;  
}

Expected result:
----------------
Expected to get
"default" and "ERR_ONE: int(-1)"

Actual result:
--------------
ERR_ONE: bool(true) ERR_ONE: int(-1)