During November 2024, Fabien Cien worked on the trezor/trezor-firmware repository, focusing on improving the stability of coin labeling checks. He addressed a build and test blocker by updating the coin_info.py module, modifying a regular expression to support coin labels that do not begin with uppercase letters, specifically accommodating eCash and xRhodium. This Python scripting work, leveraging regular expressions and configuration management skills, ensured that the make defs_check process would pass for new coins with lowercase-prefixed labels. Fabien’s disciplined, single-commit approach included a clarifying maintainer comment, resulting in a maintainable, well-documented solution that prevents future manual overrides.