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Instructions for AI agents working in this repo

Prefer using Optional[int] rather than int | None.
If there is an error the user will see (e.g. ValueError), make sure there is enough context in the message for the user. For example, if it is during an expression parse, include the ast.unparse(a) in the error message.
Before finishing, make sure flake8 runs without errors on source and test files.
Before finishing, also make sure black runs without modifying files.