JuliaData / CategoricalArrays.jl / 1152

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Add function to get integer code from CategoricalValue (#239)

Return a `Signed` integer for convenience. This requires widening the type
to avoid the risk of overflow, which has the advantage of giving `Int` by default.
Also propagate `missing` for convenience.

Also add `levels(::CategoricalValue)` to complement the new function.

12 of 12 new or added lines in 2 files covered. (100.0%)

615 of 654 relevant lines covered (94.04%)

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