2-arg vectorized trunc doesn't work in Julia 0.5

[giordano]

In Julia 0.5

julia> trunc.(Int, 10rand(10))
ERROR: MethodError: no method matching size(::Type{Int64})
Closest candidates are:
  size{N}(::Any, ::Integer, ::Integer, ::Integer...) at abstractarray.jl:48
  size(::BitArray{1}) at bitarray.jl:39
  size(::BitArray{1}, ::Any) at bitarray.jl:43
  ...
 in broadcast_shape(::Type{T}, ::Array{Float64,1}) at ./broadcast.jl:31
 in broadcast_t(::Function, ::Type{Any}, ::Type{T}, ::Vararg{Any,N}) at ./broadcast.jl:213
 in broadcast(::Function, ::Type{T}, ::Array{Float64,1}) at ./broadcast.jl:230

Vectorized version of trunc is now preferred in master, after (probably) JuliaLang/julia#19791. Any chance to make it work in Julia 0.5 using Compat.jl?

[TotalVerb]

See also related #291. Most of the broadcasting infrastructure would be quite difficult to backport, unfortunately.

[giordano]

See also related #291.

I know, I'm the same who reported that one ;-)

Most of the broadcasting infrastructure would be quite difficult to backport, unfortunately.

I suspected that, but keeping compatibility in packages for both 0.5 and 0.6 is hard. I have to choose between dropping support for 0.5 now and updating the package later. I think I'll do the former as soon as 0.6 is out.

[stevengj]

We could define a limited number of broadcast and broadcast! methods just so that people can remove deprecations. e.g. broadcast(f::Function, T::Type, A::AbstractArray) = broadcast(x -> f(T, A), A) for the trunc, round, etcetera methods.