__toString & friends

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I was asking myself if there was a good reason
__toBool // __toInt
NOT been present in my favorite language,
It is sooooo coool beeing able to cast object as string resulting in a 
__toString() call
I'll really love being able to
class error extends exeption {
 __toBool(){return false; }
}

....

if((bool) $result ) echo "This is ok";


..

131 - praying for a automatic method called at casting request. 



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