[HACKERS] mutibyte aware functions

[Tatsuo Ishii]

I have made lpad/rpad/btrim/ltrim/rtirm/translate functions multibyte
aware. I think we could mark following item as "done".

* Make functions more multi-byte aware, e.g. trim()

Anything I forgot to make multibyte aware?
--
Tatsuo Ishii

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