Hi Sean, I'm really confused by the output you're showing.
> > X = [1,2]; Y = [1,2]; > > append!(X,Y) > 4-element Array(Int64,1): > 1 > 2 > 3 > 4 Do you really get this output? That seems like a huge bug if so. But I don't see that at all, which is what I'd expect. -- John