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Immutability

Immutably clone (copy) objects and override their properties. Works for readonly classes and properties as well.

A PHPStan rule, which checks all classes implementing (or interfaces extending) Eboreum\ImmutableInterface\ImmutableInterface (available in the eboreum/immutable-interface package) for adherence to immutability.

Implement Eboreum\ImmutableInterface\ImmutableInterface on any class to flag it as being immutable. An immutable object must never change its state; i.e. its class properties must remain unchanged after instantiation or cloning.