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Improvement/alternative to: #169
Swaps excel processing engine from openpyxl to python-calamine, converting XLSXConverter to more generic ExcelConverter
Python-Calamine (https://pypi.org/project/python-calamine/) supports .xls, .xlsx, .xlsm, .xlsb (also .ods)
Calamine is rust based and so should also provide a bump in performance. No stats available but have found it more reliable than openpyxl & xlrd from personal experience.
Argument against could be that is that pandas needs to be >=2.2 / python-calamine is not as well known