PEP 544: Couple final edits

[ilevkivskyi]

This includes couple edits inspired by recent discussions:

• Remove mention of metaclasses from implementation details section (PEP 560 makes them unnecessary).
• Explcitly mention callback protocols as an important use case.

cc @ambv @JukkaL @gvanrossum

[gvanrossum]

Are callback protocols well known to the other type checker teams, or do we have to remind them of this addition to the PEP?

[ilevkivskyi]

Are callback protocols well known to the other type checker teams, or do we have to remind them of this addition to the PEP?

I am not sure, but it is a relatively old feature in mypy (since August IIRC) and it appeared many times in discussions on Gitter. Plus IMO it is not that special from the point of view of "theory", it is just important from practical point of view.

[ilevkivskyi]

On the other hand we can post a brief summary of all recent changes to the PEP. What do you think?

[gvanrossum]

TBH I just want to accept it. But if you can post a summary that would be great.

On Fri, May 24, 2019 at 06:06 Ivan Levkivskyi ***@***.***> wrote: On the other hand we can post a brief summary of *all* recent changes to the PEP. What do you think? — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#1084?email_source=notifications&email_token=AAWCWMUOZDFLHRCCYFPHS6LPW7R6DA5CNFSM4HPKTSFKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODWFIXPY#issuecomment-495619007>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAWCWMWGIG5YUPF6UJVNLHDPW7R6DANCNFSM4HPKTSFA> .

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