RE: On language-dependent defaults for character-folding

[Drew Adams]

> >>> For the release, I think we should turn it off by default
> >>> and invite people to try turning it on.
> >>
> >> That would be a grave mistake, IMO, since at least some parts of
> >> folding are a must, and no one objected to them till now (neither
> >> would I expect to see any objections).  See my other message for
> >> details.
> >
> > Some parts are a must?  Which parts, and a must for what?
> > A must for the _default_ behavior?
> 
> I guess Eli had pairs such as .../. in mind; I have not any
> disagreement about them.

Why would such pairs be a "must" in terms of the default behavior?