Re: Don't bail out on :package-version in `defcustom'

Michael Sperber writes:
 > 
 > "Stephen J. Turnbull" <[email protected]> writes:
 > 
 > > Michael Sperber writes:
 > >
 > >  > +:package-version
 > >  > +        VALUE should be a list with the form (PACKAGE . VERSION)
 > >  > +        specifying that the variable was first introduced, or its
 > >  > +        default value was changed, in PACKAGE version VERSION.  This
 > >  > +        keyword takes priority over :version.  The PACKAGE and VERSION
 > >  > +        must appear in the alist `customize-package-emacs-version-alist'.
 > >
 > > Will an error be signaled if not?  Where?
 > 
 > No.

I hate Elisp (almost as bad as X) for being so shoddy about validating
arguments....

 > > This really should document the format of VERSION.
 > 
 > Yes, I was wondering about that, too, but the format seems to be
 > unspecified in GNU Emacs, as well.  Should we pick one?

No, I mean whether it's a cons or a string.  In the part somebody cut
custom-add-package-version takes a VERSION argument.  However, I
suspect the VERSION argument is not just a version string, but rather
a (PACKAGE . VERSION) cons as documented above for the
:package-version key.

I think that picking a format for either PACKAGE or VERSION is not
going to work.  Just let them be strings and we'll deal with
inconsistencies in `customize-package-emacs-version-alist' if and when
it ever bugs somebody.