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We should carefully distinguish all kinds of RPC errors (parameters parsing errors / handling errors / server errors / etc.) on the server side. Each meaningful error should have a separate meaningful error code.
All possible errors for each RPC call should be documented.
All possible errors should be presented as exported variables and have proper comments for external users.
RPC client should be able to distinguish errors by codes and should return these specific errors. Users should be able to identify them via errors.Is(...)
All errors and error codes should be compatible with the reference implementation, so we may add an issue about errors naming to neo-modules repo.