One-dimensional views assume their range index is 1-indexed

[jishnub]

This happens if the range used to create the view does not span the entire axis of the parent array

julia> b = zeros(6, 2);

julia> r = Base.IdentityUnitRange(4:6);

julia> b[r, 2] .= 3
3-element view(::Array{Float64,2}, :, 2) with eltype Float64 with indices 4:6:
 3.0
 6.90395899974187e-310
 6.90395899973673e-310

julia> b
6×2 Array{Float64,2}:
 0.0  0.0
 0.0  0.0
 0.0  0.0
 0.0  0.0
 0.0  0.0
 0.0  0.0

[mbauman]

This is just an overzealous <:AbstractUnitRange method that optimizes for one range index within the SubArray implementation.