Zero-dimensional arrays are acting strange

[sadish-d]

For anyone interested, here’s some earlier discussion on a similar topic. People smarter than I also tend to think that behavior of Array{Int64, 1}(), Array{Int64, 0}(), Array{Int64, 2}() is inconsistent.

Why does Array{Int}() product Array{Int, 0} and not Array{Int, 1}

Union{Missing, T} is not 100% as fast as just using T, causes more allocations, and is not compatible with C code: julia> struct Foo x::Int end julia> struct FooM x::Union{Missing,Int} end julia> function fillfoo(T,n) ret = Array{T}(undef, n) for k = 1:n ret[k] = T(1) ret end end julia> @time fillfoo(Foo, 100000); 0.046550 seconds (199.50 k allocations: 3.808 MiB) julia> @time fillfoo(FooM, 100000); 0.049624 seconds (…