SubArray is not AbstractArray

General Usage
1

I was trying to fit a SubArray into a field of AbstractArray type and was surprised by this. I thought most, if not all, array types should be AbstractArray’s… Any reason why not?

julia> SubArray isa AbstractArray
false
2

I think you want/need SubArray <: AbstractArray instead.

I think of x isa T as translating to typeof(x) <: T.

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