bug#30788: 27.0.50; Getting 'char-displayable-p: Invalid hash table rehash size: 1.0' when starting emacs -Q

[Eli Zaretskii]

> From: Peter Dyballa <Peter_Dyballa@Web.DE>
> Date: Tue, 15 May 2018 23:38:06 +0200
> Cc: rgm@gnu.org,
>  30788@debbugs.gnu.org
> 
> > Does the workaround in
> > 
> >  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30788#26
> > 
> > succeed to solve the problem in your case?
> 
> Yes, this works. All other locales can be different. This works with GNU 
> Emacs 26.x and 27.0.50.
> 
> In one desktop file I have "(normal-height . 0,5) (normal-width . 1.0)" 
> (Emacs version 25.3.1)…

So the next question is: which software resets the LC_NUMERIC setting?
Perhaps by running Emacs under a debugger with a breakpoint on
set_locale could answer that question.