Hi,

In message "Re: Memory behavior of String#dup"
    on 03/07/02, Yukihiro Matsumoto <matz / ruby-lang.org> writes:

|Putting joke aside, frozen key string is very useful for finding
|bugs.  So I think optimization should be done differently.

Your suggestion inspired me a new dup-freeze optimization.  It'll be
available soon on the CVS.  Thank you.

							matz.