Re: master 45a1653: ; Fix last change to bibtex.el

["Roland Winkler" <winkler@gnu.org>]

On Wed Nov 18 2020 Basil L. Contovounesios wrote:
> > Why local at all by default?  All other BibTeX customizations by
> > default apply to all BibTeX buffers.
> 
> Good point.  I've now reverted it.

Thinking once more about this I am not sure this is the best
approach in the first place.  The way bibtex-unify-case-convert is
defined now as a function, it should get a :rsiky tag, it should not
be used as a file-local variable.  On the other hand, the most
common scenario I can think of for situations, where one wants to
have buffer-local values for bibtex-unify-case-convert is via
file-local settings.  So I think it makes more sense that
bibtex-unify-case-convert should be one of the symbols identity,
downcase, capitalize or upcase.  And these symbols are allowed as
buffer-local variables.  (I cannot think of a useful scenario beyond
this that would justify a user-defined function.  Am I missing
something?)

From a different perspective, if bibtex-unify-case-convert was a
variable holding a function name, the variable name should be
something like bibtex-unify-case-convert-function.