[perl #125927] नि -- a grapheme cluster boundary algo problem (CCC = 0 can be a valid combiner?)

[Tobias Leich via RT]

Here are more examples (by novapatch++ via irc):

m: say «நி กำ षि "\r\n"»».chars
rakudo-moar cd7766: OUTPUT«(2 2 2 2)␤»