Variable: savehist-coding-system
savehist-coding-system is a variable defined in savehist.el.gz.
Value
utf-8-unix
Documentation
The coding system Savehist uses for saving the minibuffer history.
Changing this value while Emacs is running is supported, but considered unwise, unless you know what you are doing.
Source Code
;; Defined in /usr/src/emacs/lisp/savehist.el.gz
;; This should be capable of representing characters used by Emacs.
;; We prefer UTF-8 over ISO 2022 because it is well-known outside
;; Mule.
(defvar savehist-coding-system 'utf-8-unix
"The coding system Savehist uses for saving the minibuffer history.
Changing this value while Emacs is running is supported, but considered
unwise, unless you know what you are doing.")