EnumTrait usage

EnumTrait_Sample.php

<?php
final class GameDifficulty
{
    const HARD = 'hard';
    const NORMAL = 'normal';
    const EASY = 'easy';
    
    use EnumTrait {
        constant as public HARD;
        constant as public NORMAL;
        constant as public EASY;
    }
}

final class CheeseType
{
    const HARD = 'hard';
    const SEMIHARD = 'semihard';
    const FRESH = 'fresh';
    
    use EnumTrait {
        constant as public HARD;
        constant as public SEMIHARD;
        constant as public FRESH;
    }
}

$difficulty = GameDifficulty::HARD();

var_dump($difficulty === GameDifficulty::HARD()); // bool(true)
var_dump($difficulty === CheeseType::HARD()); // bool(false)

var_dump($difficulty->is(GameDifficulty::HARD())); // bool(true)
var_dump($difficulty->is(CheeseType::HARD())); // throw TypeError