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> Does the reference manual actually say that a Name does not depend on
> locale, it depends on lctype.h?

The manual says that Names can be any string of letters, digits, and
underscores, not beginning with a digit. It is assumed that everyone
knows what a letter is :-)

lctype.c contains a no-surprise table. It's there for two purposes:
to avoid the locale-dependent ctype table from the C library and
(secondarily) to allow it to be changed in cases one really needs to.