Widen RangeIndex from Int to BitInteger

Author: mkitti

base/array.jl

@@ -36,7 +36,7 @@ const AbstractMatrix{T} = AbstractArray{T,2}
 Union type of [`AbstractVector{T}`](@ref) and [`AbstractMatrix{T}`](@ref).
 """
 const AbstractVecOrMat{T} = Union{AbstractVector{T}, AbstractMatrix{T}}
-const RangeIndex = Union{Int, AbstractRange{Int}, AbstractUnitRange{Int}}
+const RangeIndex = Union{<:BitInteger, AbstractRange{<:BitInteger}}
 const DimOrInd = Union{Integer, AbstractUnitRange}
 const IntOrInd = Union{Int, AbstractUnitRange}
 const DimsOrInds{N} = NTuple{N,DimOrInd}