Some methods that exist on NumPy-backed pd.Index are not currently available when pd.Index is backed by ArkoudaExtensionArray. It’s unclear whether these gaps should be addressed by:
implementing the methods in the existing Index accessor, or
fixing/adjusting inheritance/dispatch so pd.Index exposes them directly.
This ticket is to identify the missing methods, determine why they aren’t inherited, and recommend the best fix (accessor vs inheritance), with notes on compatibility and performance tradeoffs.