REF: use _validate_foo pattern in Categorical#36181

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jreback merged 2 commits intopandas-dev:masterfrom

jbrockmendel:box-mixin

Sep 7, 2020

Commits on Sep 7, 2020

REF: use _validate_foo pattern in Categorical
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Merge branch 'master' of https://github.com/pandas-dev/pandas into box-mixin
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