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 - Find a nicer syntax for the `write_config` test.
 - Prevent construction of internal types.
 - More specific error checking in the tests.
-- Differentiate empty strings and errors (see `result_from_string`).
 - Check integer conversions.
 - Consider implementing `Into<CommandError>` for `(Device, CommandError)`
 - Lock password safe in `PasswordSafe::drop()` (see [nitrokey-storage-firmware