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bug#30943: save-hist creates massive cache file

From: Glenn Morris
Subject: bug#30943: save-hist creates massive cache file
Date: Tue, 27 Mar 2018 15:12:51 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)

Eli Zaretskii wrote:

> Save-hist doesn't truncate any variables except the ones it knows
> about, because it cannot be sure that truncating some list might leave
> the variable with an invalid value.

savehist doesn't truncate anything AFAICS.
It just assumes variables are trimmed by add-to-history etc in the
course of normal operation. So if you add a non-history variable to
savehist (or set history-length to t), it will eventually blow up.

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