When capitalize/2 was written, Erlang did not provide titlecase
functions. capitalize/2 also downcases the rest of the string
while Erlang doesn't, which is a common contention point.
Given our titlecase implementation requires 40kb of additional
code in .beam files, it makes sense to unify it with Erlang's
(which we have already done for most non-critical functionality
in unicode).
José Valim
76a92b5a80