Improve error handling #300
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TODO: Export errors to Python
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This PR adds
snafufor error handling. The error messages are more precise, provide more context than the previous ones, and specific type errors are handled in their own error structs. All error structs are marked as non-exhaustive to allow for expanding at a latter date.I'd like to have the same errors be available from Python, but I'm waiting to hear back from PyO3/pyo3#4165 for implementation recommendations.
Closes #245 .