Case folding vs. toLower()

[ezzatron]

Case folding is a much more aggressive operation that is (as I understand it) intended for use in comparison, but not display logic. Furthermore, lowercasing is not even necessarily a subset of case folding (needs investigation).

I have made the mistake of using lowercasing where case folding was specified, which is one part of this problem. BUT perhaps more importantly, there is discussion in the PRECIS WG about whether case folding is actually the appropriate operation to use at various points in the spec, especially in "enforcement". I believe there is talk of an addendum of sorts to address this.

See discussion under #1, as well as these links to discussion provided by @stpeter:

• https://mailarchive.ietf.org/arch/msg/precis/Jua858TgnE6GFGb5XUnPqPK3CmQ
• https://mailarchive.ietf.org/arch/msg/precis/-sF4quVE-xnm-DMSbP4X1VXGlc4