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* Add documentation and examples on :ref:`ewx_polars` to demonstrate new `Polars
<https://www.pola.rs>`_ integration of XlsxWriter in `write_excel()`_.
.. _write_excel(): https://pola-rs.github.io/polars/py-polars/html/reference/api/polars.DataFrame.write_excel.html#polars.DataFrame.write_excel
* Add fix for rare issue with duplicate number formats.