[R6RS] Case sensitivity

[Marc Feeley]

> 3) The meaning of "case-insensitivity" does not depend on natural
>    language.  In Turkish, "i" is *not* the lower-case variant of "I"
>    (it is dotless-i).  In some natural languages, case is important
>    (isn't German one of those languages?).  We should avoid specifying
>    the lexical syntax of Scheme in such a way that cultural
>    conventions can't be followed.

Sorry, I meant "The meaning of "case-insensitivity" depends on natural
language."

Marc