Unexpected dimension values after sum

Not sure how important this is. I hit this scenario, but at least I can extract the numbers I need. How are dimension values named after aggregation? Here's a nice example: ``` A = rand(X(1.0:0.2:2.0), Y([:a, :b, :c])) sum(A; dims=2) ┌ 6×1 DimArray{Float64, 2} ┐ ├──────────────────────────┴───────────────────────────────── dims ┐ ↓ X Sampled{Float64} 1.0:0.2:2.0 ForwardOrdered Regular Points, → Y Categorical{Symbol} [:combined] ForwardOrdered └──────────────────────────────────────────────────────────────────┘ ↓ → :combined 1.0 2.38466 1.2 1.65471 1.4 1.2786 1.6 0.525329 1.8 1.11983 2.0 0.838832 ``` The Y now has only one value which is `:combined`. Ok nice. Here's an example where it's less nice: ``` @enumx MyThing Thing1 Thing2 A = rand(X(1.0:0.2:2.0), Y([(MyThing.Thing1, "rah"), (MyThing.Thing2, "lala"), (MyThing.Thing1, "hmm")])) sum(A; dims=2) ┌ 6×1 DimArray{Float64, 2} ┐ ├──────────────────────────┴──────────────────────────────────────────────────────────────────────────── dims ┐ ↓ X Sampled{Float64} 1.0:0.2:2.0 ForwardOrdered Regular Points, → Y Sampled{Tuple{Main.MyThing.T, String}} [(Main.MyThing.Thing2, "lala")] ForwardOrdered Irregular Points └─────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ ↓ → (Thing2, "lala") 1.0 1.22294 1.2 1.76796 1.4 1.25219 1.6 2.16251 1.8 0.974786 2.0 1.41384 ``` The Y now takes an arbitrary value of one of the pre-aggregation values.