default 0 integer fail in laravel 7 code example

Example 1: email validation in laravel

'email' => 'required|email|unique:users,email',
//@sujay

Example 2: laravel validation

/**
 * Bootstrap any application services.
 *
 * @return void
 */
public function boot()
{
    Validator::extend(...);

    Validator::replacer('foo', function ($message, $attribute, $rule, $parameters) {
        return str_replace(...);
    });
}