bug#59882: Multiple versions of Org in load-path problem

[Max Nikulin <manikulin@gmail.com>]

On 18/12/2022 22:40, Stefan Monnier via Bug reports for GNU Emacs, the 
Swiss army knife of text editors wrote:
>> - "emacs -l org" to simulate a regular user session with some opened files.
>> - Update to Org-9.6 from ELPA.
>> - Close emacs and start it again "emacs -l org"
>>
>> Result:
>> byte-code: Invalid function: org-assert-version
> 
> Hmm... there's code in `package.el` intended to avoid that problem, but
> clearly it's failing here.  Could Someone™ investigate why that code
> doesn't do its job.
> 
> The code in question is in `package--reload-previously-loaded`

Since I managed to reproduce the issue with emacs-28.2 built from source 
tree, I tried current master (30.0.50) as well. I used the following 
trick to shadow org-assert-version:

sed -i -e 's/org-assert-version/org-assert-version-old/g' lisp/org/*.el

I am unable to reproduce the "Invalid function: org-assert-version" 
issue. Org compilation finishes without warnings.

I have noticed that neither `package--reload-previously-loaded` nor code 
loading already compiled package unload the loaddefs file. E.g. I added 
org-stale-function marked as autoload. It is possible to get help for 
this function, but attempts to call this function causes "Autoloading 
file" error. Ideally emacs should completely forget about such functions 
when newer elpa package is installed.