> On Apr 24, 2018, at 9:38 AM, David Storrs <david.sto...@gmail.com> wrote:
> On Tue, Apr 24, 2018 at 12:09 PM, David Storrs <david.sto...@gmail.com 
> <mailto:david.sto...@gmail.com>> wrote:
>> On Tue, Apr 24, 2018 at 11:11 AM, Vincent St-Amour
>> <stamo...@eecs.northwestern.edu> wrote:
>>> FWIW, this `multi-partition` sounds a lot like the built-in `group-by`.
>> It has significant extra processing options:

FWIW as a fan of both `partition` and `group-by`, I think `multi-partition` is 
a misnomer. In math, a partition is any division of a set into nonintersecting 
subsets — maybe two pieces, maybe more. So coinages like `multi-partition` and 
`#:partitions` seem squishy. Also, whereas `partition` is essentially two 
`filter`s, your `multi-partition` works in terms of equivalence classes (which 
is the underlying idea of `group-by` too).

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