python3, hgloader, and extensions

[Ludovic Chabant]

> I don't care much about the correctness of the hgloader. It's a temporary
> hack, and Python 3 support is still experimental.

I understand it's experimental but you can expect sourcehut to push somewhat aggressively on it :)

> > Is the plan to run byteify-strings.py on the mercurial codebase then?
> 
> It's the plan as far as I know.

Ok, I just re-sent the patch for the evolve extension then. Thanks!