i'm trying to understand why we don't have something similar in terms of
comparison for Nullable as we have for DataArrays NAtype (below). point me
to the relevant github conversation, if any, is fine.

How would I implement methods to find the maximium of an
Array{Nullable{Float64}}? like so?

Base.isless(a::Any, x::Nullable{Float64}) = isnull(x) ? true :


# Comparison operators

Base.isequal(::NAtype, ::NAtype) = true
Base.isequal(::NAtype, b) = false
Base.isequal(a, ::NAtype) = false
Base.isless(::NAtype, ::NAtype) = false
Base.isless(::NAtype, b) = false
Base.isless(a, ::NAtype) = true

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