The iterator `eachfactor` is not type-stable

[byhill]

Consider the following code.

julia> eltype(eachfactor(Int32(901800900)))
Tuple{Int32, Int64}

julia> for (p, e) in eachfactor(Int32(901800900))
       println()
       println((p, typeof(p)))
       println((e, typeof(e)))
       end

(2, Int32)
(2, Int64)

(3, Int64)
(2, Int64)

(5, Int64)
(2, Int64)

(7, Int64)
(2, Int64)

(11, Int32)
(2, Int64)

(13, Int32)
(2, Int64)

The eachfactor iterator should return (at least based on it's eltype) Tuple{Int32,Int64} but it returns a mixture of Tuple{Int32,Int64} and Tuple{Int64,Int64}.

[oscardssmith]

ah good catch. This was mostly tested on Int64 inputs. Fixing this should be pretty easy.

[oscardssmith]

fixed and version tagged (Pkg should know about it in ~1 hr)