RE: char equivalence classes in search - why not symmetric?

[Drew Adams]

> > What is its equivalent for letter-case differences?  IOW, how do I
> > search for a without also catching A?
> 
> Maybe the default is wrong:
> a should catch only a (and not aAàá etc.)
> a case modifier would allow a to catch aA
> and a diacritic modifier would allow a to catch aàá etc.
> the free case and diacritic modifier can be combined so that a can catch
> aAàÀáÁ etc.
> 
> ie, the default it to catch *exactly* what the user types.

Personally, I too think that is better default behavior.
For char folding, case folding, and whitespace folding.

But it's not very important, as long as users can (a) set
their own default behavior by customizing one or more options
and (b) easily toggle each kind of folding on the fly.