VO with possible invalid state

Email.php

<?php

namespace Email;

interface EmailAddress {
    public function isValid(): bool;
    public function asString(): string;
}

class ValidEmailAddress implements EmailAddress {
    private function __construct(
        private string $email
    ) {}
    
    public static function create(string $input): EmailAddress {
        if(filter_var($input, FILTER_VALIDATE_EMAIL)) {
            return new self($input);
        }
        
        return new InValidEmailAddress($input);
    }
    public function isValid(): bool {
        return true;
    }
    public function asString(): string {
        return $this->email;
    }
}

class InValidEmailAddress implements EmailAddress {
    public function __construct(
        private string $email
    ) {}
    public function isValid(): bool {
        return false;
    }
    public function asString(): string {
        return $this->email;
    }
}