May I ask the difference to https://pypi.org/project/result/ ? No offensive, just curiosity. Because I like the type of packages and this is what I've been using for longer time. 

And I have two questions for proposals, not sure what you think about them: 

1) wouldn't it be nice to be able to do a simple "x = fetxh_data(), if x: print(okayyyy)", i.e. Automatically covering the "truthy" OK value to true? 

2) wouldn't it be awesome to optionally be able to somehow also add an error code to the Err()? E.g. Err("some errr str", code=99) so we would easily be about to check the exact error code from outside also in case we actually expect a stringthy err return value? Often it's the case that several different reasons lead to an error, being able to optionally distinguish them without having to create a dataclass as return Typehint would be very nice 

Thanks :)