- update to 3.23.0:
  - Fix a problem in the parsing of faulty unbalanced context
    expressions. Thanks to Samuel Thibault.
  - Fix a buffer overflow problem when ~output.length~ is larger than
    ~input.length~. Thanks to Samuel Thibault.
  - Fix an endless loop in the handling of computer braille. Thanks to
    Bert Frees.
  ** Braille table improvements
  - Remove computer braille from Japanese Kantenji as it is not part of
    the standard. Thanks to Kensaku Yoza.
  - Bring Swedish tables up to date with the latest standard published
    by Punktskriftsnämnden (the Swedish Braille Authority) in 2009. The
    table for uncontracted braille was replaced and new tables for
    (partially and fully) contracted braille have been added. Thanks to
    David Renström from Insyn Scandinavia AB.
  - Improvements to Hungarian (added more exceptions) and migration to
    the ~nonumsign~ opcode thanks to Attila Hammer.
  - Fixed a bug in the Ukrainian table that led to wrong translation of
    some uppercase letters. Thanks to Andrey Yakuboy and Bert Frees.
  - Augment the UEB grade 2 tables to resolve an ambiguity between lower
    groupsigns and punctuation at the beginning of words by placing a letter
    sign at the front of punctuation. This resolves an ambiguity between, for
    example, "discount" and ".count". Thanks to Krzysztof Drewniak.
  - Add a new table for /Chinese Common Braille Scheme/ which is a type
    of braille used for spelling Mandarin Chinese. It is a variant of
    the /Chinese Current Braille System/ but has more perfect marking
    rules and produces less ambiguity than the latter. For more
    information see the comments in ~zhcn-cbs.ctb~. Thanks to Cary-Rowen
    and Frank.
  - Updates to the Chinese bopomofo braille table thanks to Bo-Cheng

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