Some of my favourite diffs were related to linters: - Linting files different from origin/master in a pre-commit hook. - Linting everything in CI. - Making t

Some of my favourite diffs were related to linters: - Linting files different from origin/master in a pre-commit hook. - Linting everything in CI. - Making the linter rules stricter (mypy does a great job of having several orthogonal strictness flags, so you can pick the set appropriate for your familiarity with the tool). - Implementing project-specific lint checks.