well, did a quick test and no, not a single one of them fail.
but, they kinda do.
if you don't set casesensitivity, kixtart uses double 7 bit chartable, kinda...
well, see for yourself:
Code:

;fill a string with all chars...
;then, let's split with them.
;if split fails, spit out what was that char it errored on.
$=setoption("casesensitivity","on")
for $ascii=1 to 255
$char=chr($ascii)
$charstring=""+$charstring+$char
if 1<>ubound(split($charstring,$char))
? "Character #" $ascii " (" $char ") failed the split test"
endif
next

get $

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