trying to implement a class that is both an hash and an array, I have problem to access an element of an array using a .[] The method I declared is not used.

DOM.raku

class DOM {
  has @!kids handles <shift unshift push pop elems>; 
  has %!attrs;
  method kids-delete(*@indices) { @!kids.delete(@indices) }
=begin pod
A class may define methods that allow it to respond as if it were a
routine, array, or hash.  The long forms are as follows:

    method postcircumfix:<( )> (|capture) {...}
    method postcircumfix:<[ ]> (**@slice) {...}
    method postcircumfix:<{ }> (**@slice) {...}

Those are a bit unwieldy, so you may also use these short forms:

    method &.( |capture ) {...}
    method @.[ **@slice ] {...}
    method %.{ **@slice } {...}
=end pod
  # cargo cult.
  method postcircumfix:sym<[ ]>(**@slice) { say "help!"; @!kids[@slice] }
}
my $d = DOM.new; 
print "$d.elems() ";
$d.push: 'hi!'; 
$d.push: 'bye!'; 
$d.kids-delete(0); # ok
print "$d.elems() ";
say $d[0];  # does not work. prints "DOM.new()"
$d.pop;
say "$d.elems() ";

=begin END

0 2 DOM.new()
1