`rebar` overrides via mix, how?

So I hit upon this: https://github.com/erlware/relx/issues/496#issuecomment-274202734

Anyone know how to specify a rebar override while using mix to force :debug_info generation since relx is still borked?

Mix does not have the concepts of overrides. In this case though, why are you including relx in your plt?

Default option in dialyxer, no clue. Dialyxer has no option to exclude packages (yet).