Add keytype method for AbstractArray and AbstractVector (part 2)

Now also for the type, not just for objects.
JuliaLang · mbauman · Apr 4, 2019 · Jun 23, 2018 · Jun 24, 2018 · Mar 25, 2019
commit ab76e1afe97eb98acf61ccc5c4765caa859afb06
diff --git a/base/abstractarray.jl b/base/abstractarray.jl
@@ -99,6 +99,9 @@ keys(a::AbstractVector) = LinearIndices(a)
 keytype(a::AbstractArray) = CartesianIndex{ndims(a)}
 keytype(a::AbstractVector) = Int
 
+keytype(A::Type{<:AbstractArray}) = CartesianIndex{ndims(A)}
+keytype(A::Type{<:AbstractVector}) = Int
+
 prevind(::AbstractArray, i::Integer) = Int(i)-1
 nextind(::AbstractArray, i::Integer) = Int(i)+1