I got the idea, it's essentially writing a template without writing template. I feel super dirty with that one, don't know how that managed to make it in to the standard (specially considering that it can be written in a more explicit way), but that's just the status quo.
I guess there was too much over the keyword auto at the time.
From: Std-Proposals <std-proposals-bounces@lists.isocpp.org> on behalf of Jan Schultke via Std-Proposals <std-proposals@lists.isocpp.org>
Sent: Friday, March 1, 2024 6:34:36 PM
To: Barry Revzin <barry.revzin@gmail.com>
Cc: Jan Schultke <janschultke@googlemail.com>; Christof Meerwald <cmeerw@cmeerw.org>; std-proposals <std-proposals@lists.isocpp.org>
Subject: Re: [std-proposals] The Oxford variadic comma
 
> Uh, why not? Is there a particular reason why it's important to allow omitting the comma specifically here?

Because this is an abbreviated variadic function template.

If f(auto... x) is a variadic function template, removing x should
result in a function template with the same type. This is the case in
the current draft, it's totally fine, I'm happy with it, and I'm not
deprecating it.
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