bug#45708: 27.1; (setq inhibit-default-init t) not working

[Leo Liu]

I tried to move to 27.1 in Oct 2020 but my setup was badly broken.

So I tried again today and I discovered the culprit seemed to be that
default.el is loaded regardless of (setq inhibit-default-init t) in my
emacs init file.

My emacs setup has been working flawlessly since at least Emacs 24.

This incompatibility seems unintentional because the elisp documentation
specifically allows setting inhibit-default-init in user init file.