package MyApp {
  use Zydeco;
  
  class Widget {
    has id;
    
    factory new_widget ( Int *id ) {
      state %objects;
      $objects{ $arg->id } //= $class->new( %$arg );
    }
  }
}

my $foo = MyApp->new_widget( id => 42 );
my $bar = MyApp->new_widget( id => 42 );

die unless $foo == $bar;