Syntax for union types

[zwetan]

On Nov 9, 2007 4:31 PM, Lars Hansen <lhansen at adobe.com> wrote:
[snip]
>
> (More interesting open questions about the language are whether generic
> functions ought to be available on instances or discriminating on
> structural types, or whether packages ought to be sealable for security,
> or whether ES4 precludes the use of current ES3 AOP patterns and how
> that might be solved.  Among other things.)
>

the option to have sealed package would be indeed an interesting feature in ES4,
is this is discussed somewhere in the wiki ?

cheers,
zwetan