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Decide whether (new) ExtensionArrays and Dtypes are public #22860

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@TomAugspurger

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@TomAugspurger

This mostly affects

  1. IntervalArray
  2. PeriodArray
  3. DatetimeArray (and maybe TimedeltaArray if we do that)
  4. SparseArray
  5. IntegerArray

Categorical is already public, so let's leave that out.


A few questions

  1. do we allow users to construct these directly (via a set of to_*_array methods, or a top-ish-level pd.array([...], dtype) method)?
  2. Do users see these when they do .values or any operation returning an array (.unique, probably others)?

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