fix: null handling and numeric correctness in statistics, metrics and parsing - #214

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

The import of ‘DataFrame.Model’ is redundant

The import of ‘DataFrame.Model’ is redundant

This binding for ‘df’ shadows the existing binding

This binding for ‘df’ shadows the existing binding

The import of ‘DataFrame.Model’ is redundant

Pattern matching on GADTs without MonoLocalBinds is fragile.

Pattern matching on GADTs without MonoLocalBinds is fragile.

• The constraint ‘base-4.18.3.0:Data.Typeable.Internal.Typeable

• The constraint ‘Show (Maybe a)’ matches

• The constraint ‘Eq (Maybe a)’ matches