I've started on that, but shuffle doesn't exist properly yet for generic 
collections. I could just use (shuffle (sequence->list ....)), but, what would 
be the best way of representing this? Generic collections give you the freedom 
of creating a new type of data structure just for shuffled sequence, so would 
it be best to do that, or something else?

> On Oct 12, 2015, at 7:45 PM, Matthias Felleisen <matth...@ccs.neu.edu> wrote:
> 
> Take a crack at it. 
> 
> I am pretty sure I have introduced the proper level of representation 
> independence (I can hear Ben laugh all the way now — Typed Racket
> doesn’t have types) and the typed documentation is pretty solid. (I’ll
> do types later to validate.) 
> 
>> On Oct 12, 2015, at 7:37 PM, Alex Knauth <alexan...@knauth.org> wrote:
>> 
>> What about Alexis King's persistent vectors?

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