RE: How to find when a function/var has been added

[Drew Adams]

> customize-changed...

Yes, useful, of course.

I think maybe Przemysław is asking for something more, including
changes to the default value or possible values of an option, and
changes to the behavior or at least the calling sequence of an
existing function.

Dunno how much would be feasible or what forms it might take, but
I agree that there is a use case for it.