On 25/10/2013 22:14, Michiel Helvensteijn wrote:
> On Fri, Oct 25, 2013 at 9:59 PM, Joseph Wright
> <[log in to unmask]> wrote:
>>  - You want to make 'weird' chars (catcode tricks with \lowercase
>>    primitive)
> A thought:
> Conceptually speaking, upper-case and lower-case are concepts that
> have to do with letters, and making weird chars is a completely
> unrelated feature. The \lowercase trick is what I would call an
> implementation detail. With expl3 you have the opportunity to separate
> the two concepts in the public interface. Give the weird-char
> technique a different name... such as "bijective conversion".

We're pretty sure 'case' doesn't come into the name: our working idea is
"\tl_transform:nn" or similar, but no decision has to-date been reached.
(Prod Will, Frank, Bruno, ...!)
Joseph Wright