Warning comments about subtleties of fetching characters from buffers/strings.
src/buffer.h (FETCH_CHAR, FETCH_MULTIBYTE_CHAR): src/character.h (STRING_CHAR, STRING_CHAR_AND_LENGTH): Add comments about subtle differences between FETCH_CHAR* and STRING_CHAR* macros related to unification of CJK characters. For the details, see the discussion following the message here: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=11073#14.
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