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Thomas, if you write-up an initial patch, aim for the most conservative
version that leaves all of the behavior unchanged except for embedded
single apostrophes (to handle contractions and possessives). That will
assure that we don't muck-up any existing uses for title case:
 i'm I'm
 you're You're
 he's He's
 david's David's
 'bad' 'Bad'
 f''t f''t
 'x 'x
Given letters-apostrophe-letter, capitalize only the first letter and
lowercase the rest.