Re: Slot accessing issues in EIEIO

[Zhu Zihao]

Hmm, could you please take a look at this piece of code?
https://github.com/emacscollective/epkg/blob/master/epkg.el#L137

In this defclass definition. slots prefixed with "closql-" was reserved for
internal usage. and other slots present the columns in SQL database.

Obviously, accessing a slot in these definitions is valid. For example,
accessing slot "foobar" in that object will trigger real slot-missing method
because our definitions don't contain it. And accessing slots will trigger a
sync operation between Emacs VM and SQL database.

When we put the sync logic in slot-missing. How to distinguish really missing 
slots
and "simulated slots" is a problem.