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    for my $i ( 0 .. $#{ $self->{ keys } } ) {
        my $id = $self->{ keys }->[ $i ];
        # ...
    }
    
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    for my $i ( 0 .. $self->max_index() ) {
        my ( $key, $value ) = $self->at( $i );
        # ...
    }
    
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    my $iter = $self->iterator();
    
    while( my ( $key, $value ) = $iter->() ) {
        # ...
    }