bug#45197: Saving customizations makes ~/.config/emacs/init (no .el extension)

[tsuucat]

> I did not read those 150 messages, and this code is uncommented in
> startup.el:
> 
>     (lambda ()
>       (expand-file-name
>        "init"
>        startup-init-directory))


I found the explicit .el extension of "early-init.el” in startup.el is from
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=3d9a56f00040cbfc8fb92c4379344d7e91e2dff2.

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tsuucat