What makes you think that prefix types are a "failed experiment"?
in reply to Re^3: what would you like to see in perl5.12?
in thread what would you like to see in perl5.12?
If you are talking about prototypes, that's hardly the same.
Many staticly typed languages use it successfully, and if it stays optional I don't see a point against it.
If you don't like the notation, you are of course free to omit the types - that's why I wrote optional static typing.
BTW. I guess it would be Int @arr instead of Int @arr.
(Update: fixed thinko spotted by holli)