> Also, I want to reiterate: Any of these operations MUST be designed to return > a new value, never modify in place. These operators only make sense on value > objects, not service objects, and value objects should be immutable.
I completely agree. This was the gist of my earlier comments. Maybe we should resurrect discussion of the immutable classes and properties RFC: https://wiki.php.net/rfc/immutability If we add the ability to specify immutability, then we can enforce in the engine that the left and right operands must be immutable. For example: public function __add(immutable $left, immutable $right); Cheers, Ben
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