[issue2857] add codec for java modified utf-8

[Tom Christiansen]

Tom Christiansen <tchrist at perl.com> added the comment:

Please do not call this "utf-8-java". It is called "cesu-8" per UTS#18 at:

  http://unicode.org/reports/tr26/

CESU-8 is *not* a a valid Unicode Transform Format and should not be called UTF-8. It is a real pain in the butt, caused by people who misunderand Unicode mis-encoding UCS-2 into UTF-8, screwing it up. I understand the need to be able to read it, but call it what it is, please.

Despite the talk about Lucene, I note that the Perl port of Lucene uses real UTF-8, not CESU-8.

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nosy: +tchrist

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