Xiao Yafeng wrote:
> 1. Could I set multi-return type?like
>                          sub test as (Int, Str) {...}

"as" is coercion - so to what would it coerce? Int or Str? How could the
compiler know? Or do you mean something like a tuple?

> 2. set is unordered collection of values´╝î subset is new type.  People are
> apt to confuse the two concepts.

Note that people never write "subset" in their code, the write things like
sub f($x where { ... } )  and the  "where" constructs the subset type. I
don' think that's

> 3. Could I define primary key for a bag variable?

All items in a Bag are "primary keys", but there's no data additional
data associated with it.


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