JuliaLang/julia — comment on commit c0823073309f2d153b1a6b617e85e63e4324dacd
File:  line 0
By ViralBShah:

vcat and chat should also move to array.j, since they are unlikely to work on say, sparse arrays or other array containers. The implementations also make assumptions about array layout and strides. I think hvcat and cat, which are more general can stay in abstractarray.j.