bug#43356: Gnus: caching message headers? bug#43356

[Ozhap]

Lars Ingebrigtsen wrote:

> Thanks; I applied it to Emacs 28 with some changes.

Thank you all!

Madhu wrote:

> (I'd the default to be t)

I think I understand why: people could be using it that way already. But
keeping it nil could make correcting the documentation inconsistencies I
mentioned easier: one would merely have to add the new option to a
couple of those sections without much rewriting...

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