Alexander Hirner <a.hir...@gmail.com> added the comment:

Here, nothing but less boiler plate. 

Wouldn't it pay off to not rewrite dataclass features like frozen, replace, 
runtime refelection and the ability to use dataclass aware serialization 
libraries (e.g. pydantic)? I think @dataclass+@abstractproperty behaviour is 
yet to be defined.

The second part about subclass check is not specific to dataclasses.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39134>
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