Value object usage within Laravel Eloquent example

gistfile1.php

<?php
// In model: Ensures values are consistent
class User extends Eloquent {
  public function setEmailAttribute(Email $email) {
    $this->attributes['email'] = $email;
  }
}

// Value object
class Email {
  public $email;
  
  public function __construct($email) {
    Assert::email($email);
    
    $this->email = $email;
  }
  
  public function __toString() {
    return $this->email;
  }
}  

thx for the example. But since Email is a value object, the $email propriety needs to be private