PII masking in Polars: MaskOps 2.0, and two metrics that lied to me (opens in new tab)

MaskOps 2.0 shipped this week. Before I told anyone, I looked at my own numbers. Two of them were lying to me, in opposite directions. MaskOps is a Rust plugin for Polars that does PII masking inside the dataframe: RUT, CPF, credit cards, IBANs, and twenty-odd more families, air-gapped, with no network call, ever. If you have reached for Microsoft Presidio and found it carries no Latin American identifiers, that is the gap MaskOps fills. It does check-digit-validated RUT, CPF, and CURP detect...