REF: unwrap PandasArray earlier
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [ ] whatsnew entry

is this user facing in any way? any perf change? > is this user facing in any way? 

no

> any perf change?

we'll take a hit from the isinstance check in sanitize_array, but a pretty good improvement from removing two `maybe_coerce_values` (though i forget which was the motivating asv for this)