Hey all,

Is anyone out there using the Math repo by itself? Of those people, is anyone using the Math repo without Eigen, i.e. something in `stan/math/*/scal`

or `stan/math/*/arr`

but nothing at all from `stan/math/*/mat`

?

We’re planning to squash the prim/arr/mat distinction as it causes every one of our new developers significant pain when they first try to understand the code, and for many of us continuing pain as well.

There was some discussions of this in a previous thread here. about performance implications, but it also touched on squashing the autodiff versions (prim/rev/fwd/mix) which I think is less imperative to squash.