GeezerVison

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I've signed the CLA FWIW, guess it takes a while to process.

You should link bpo-46771 in the PR title and description.

That issue is rather long. Was this change discussed specifically? It makes it harder to instantiate this object with keyword arguments, because the attr names are underscored.

@asvetlov I don't think this is the best way to collaborate on this.

Instead of your main PR being python->python, and my PRs being asvetlov->python, can your PR be asvetlov->python, and my PRs be asvetlov->asvetlov? That just makes more sense to me.

@JelleZijlstra these arguments are essentially all internal, the end users will use wrappers in the module. And for broader context, I am trying to collaborate with Andrew on a different PR, so this was meant for Andrew first.

an your PR be asvetlov->python, and my PRs be asvetlov->asvetlov?

Now the PR is set up exactly to this. Base branch selects where the PR lands.

I don't like dataclass usage here:

1. All other asyncio classes don't use dataclasses
2. The dataclass usage is not completely hidden, dataclass.replace(), dataclass.fields(), dataclass.asdict() are implicitly supported. Do you really want to provide this?
3. If we decide to provide C Extension in the future, dropping dataclass support can break backward compatibility potentially.

Ok, noted.