Since v0.5 comprehensions are shape-preserving (https://github.com/JuliaLang/julia/pull/16622), so
m = [x for x in [1 2; 3 4]]
results in a matrix.
How should one, using a comprehension, create a vector instead? Something that better reflects a traditional
v = Int for x in [1 2; 3 4] push!(v, x) end
Preferably in an efficient way, with no temporaries.