Thanks to all who provided feedback. Unfortunately, I've decided to drop this proposal; there are two main reasons.

Firstly, I see in "Perl v5.39.4: perldelta", under "Updated Modules and Pragmata", that builtin will allow a :5.40 tag (and presumably higher version numbers in subsequent releases) which has the same functionality as my proposed :stable tag.

Secondly, there was lack of consensus on many of the proposed tags; e.g. should :weak be included in :ref; was :round a good name.

When Perl v5.40.0 is released, I'll probably just be writing: 

use builtin ':5.40';

[download]

unless I only want a restricted set, such as 

use builtin qw{true false};

[download]

Thanks again to all who participated in this RFC.

— Ken

In reply to Re: RFC: Export tags for builtin pragma [Proposal dropped] by kcott
in thread RFC: Export tags for builtin pragma by kcott

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