SparseArrays.jl

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When implementing custom array types it's useful to independently resolve indices using to_indices, and subsequently index into an underlying array with them. Right now this works with Array, but fails when the array is sparse:

using SparseArrays
let x = sparse([1 2; 3 4])
    x[1, [true, false]] # Works
    
    I′ = to_indices(x, (1, [true, false]))
    x[I′...] # => getindex not defined for Base.LogicalIndex{Int64,Array{Bool,1}}
end

This also comes up when indexing into e.g a custom array with user-defined index types, or with Not from InvertedIndices.jl (this originally came up in an issue there.)

I think it has to do with the way that sparse arrays hook into the to_indices machinery.