chore, zap to latest yuck version
Merge branch 'bld/yuck'

* bld/yuck:
  chore, zap to latest yuck version
test, provide regression case for prchunk misfeature
minor, allow the last line of a prchunk buffer to be non-terminated
hygiene, kick unused var
hygiene, use better slot names for prchunk buffer internals
Merge branch 'core/prchunk'

* core/prchunk:
  hygiene, use better slot names for prchunk buffer internals
  hygiene, kick unused var
  minor, allow the last line of a prchunk buffer to be non-terminated
  test, provide regression case for prchunk misfeature