Formulaic Contrasts

Formulaic Contrasts (version 1.0.0) is a Python library designed to build contrast vectors for statistical models defined using the `formulaic` library. It provides tools for conveniently constructing design matrices and specifying comparisons between categorical levels. The library released its 1.0.0 version, declaring the API as stable, and is part of the scverse project. Its release cadence is irregular but indicates movement towards stability.