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Which issue does this PR close?
Relates to #4166
Relates to #3999
Rationale for this change
This functionality is half-baked, with no checked, dyn variants, nor array variants
I have confirmed it isn't used by DataFusion, and any downstreams that notice its removal can easily use PrimitiveArray::unary
What changes are included in this PR?
Are there any user-facing changes?