Behavior of `CartesianIndex` for `Bool`

Internals & Design
1

The documentation of CartesianIndex states:

In particular, A[I] is equivalent to A[i,j,k...]

Currently it does not hold if i etc. is Bool. For example:

julia> x = rand(2,2)
2×2 Array{Float64,2}:
 0.937975  0.7768
 0.92419   0.502304

julia> x[CartesianIndex(true, true)]
0.9379748299581936

julia> x[true, true]
ERROR: ArgumentError: invalid index: true of type Bool

I think creating CartesianIndex with Bool should be disallowed and Integer in its constructors should be replaced by Union{Signed, Unsigned}, but I wanted to consult this before submitting an issue.

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