Raku issue

readonly.p6

class TextInput    {
  has $.value is rw is default(2);
    method value() is rw {
        return Proxy.new:
                FETCH => sub ($) { return $!value },
                STORE => sub ($, $new) {
                        X::OutOfRange .new(
                                            :range(0..50 ),
                                            :got($new),
                                            :what("Input Value")).throw if $new > 50;
                    $!value = $new * 5;
                }
    }
    
    method inc-print {
      $!value = $!value * 20;
      say $!value
    }

}
my $t = TextInput.new();
$t.value = 5;
put $t.value;
# running this method will work so it is not readonly ?
#$t.inc-print

return overrides is-rw