Commits on Mar 11, 2022

1. Implement promotion rules for CategoricalArray …

   These are rarely needed, but an exception is when storing `CategoricalArray`
   objects within arrays, as the `[a1, a2]` syntax uses promotion to choose
   the element type of the result. This previously failed as it hit a fallback
   `promote_result` method defined for `AbstractArray` in Base in range.jl,
   which tried to convert `CategoricalArray`s to `Array` by calling nonexistent
   `convert` methods for `CategoricalValue`.

   

   nalimilan committed Mar 11, 2022
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