Make an indexing enum for inflation adjustments & include with USD params

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#62 opened on Aug 28, 2021 1 comment 0 reactions 0 assignees View on GitHub

enhancement parameters

Description

Currently it could be either `None` (or `False`?) or `CPI`.

In taxcalc, this is identified via `indexed`, e.g.:

https://github.com/PSLmodels/Tax-Calculator/blob/2ccfcb446d281aa8f733be59f591de931a41ad24/taxcalc/policy_current_law.json#L153

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