John Little wrote:

> (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.

Well, it uses the format of 'isfname', but not the meaning.

> While I'm at it, \k (and \f) do not match some punctuation, even above 256. 
> For example, 
> 
>     Íž U+037E GREEK QUESTION MARK
> 
> IMO this is good, perhaps the help should be revised.

Yes, changing the meaning will cause trouble.

Perhaps it's sufficient to mention the meaning for the option.  for
'isident':
        See 'isfname' for a description of the format of this
        option.  For '@' only characters up to 255 are used.


For 'iskeyword':
        See 'isfname' for a description of the format of this option.
        For '@' characters above 255 check the "word" character class.


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