Test classifier predictions for doubly wrapped CategoricalValue - #28
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CategoricalArrays.jl release 1.0 breaks the use of
levelsandunique. They now return categorical vectors, instead of plain unwrapped vectors. It's conceivable that some interfaces for classifiers that adopt the new version without realising this breaking change will predict vectors ofCategoricalArray{<:CategoricalArray}. This PR adds a check to ensure this is not the case.