isident and iskeyword treat @ differently

(On Linux with encoding=utf-8) After

:set isident=@ iskeyword=@

\k matches Greek letters, but \i does not. The help states that both have the format of isfname, which says

Multi-byte characters 256 and above are always included, only the
characters up to 255 are specified with this option.

While I'm at it, \k (and \f) do not match some punctuation, even above 256. For example,

; U+037E GREEK QUESTION MARK

IMO this is good, perhaps the help should be revised.

Regards, John Little

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