> Does this mean you can't write
>    class Super { method something { ... } }
>    sub foo (Super $bar) { $bar.something() }
> and expect foo($obj) to work, because $obj might be:
>    class Sub is Super { # remove .something--how does that happen? }
>    foo($obj); # Boom!?
> So what happens?

For the case in point if you tried to call @array.set(0, $element) I would 
expect it to fail with an error saying you can't modify a constant array.  

The method set still exists - it just politely tells you not to call that 
method on that particular class.

No methods are removed.

This is very similar to read only strings.

Paul Seamons

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