Allow leading 0 in years parameters #703
Description
Request criteria
- I searched the zppy GitHub Discussions to find a similar question and didn't find it.
- I searched the zppy documentation.
- This issue does not match the other templates (i.e., it is not a bug report, documentation request, feature request, or a question.)
Issue description
zppy sometimes errors on leading 0s for the years, as in #694 (review); this can be resolved by better 0-handling in get_years