Hi,

In message "Re: Subrange of String subclass => invalid object"
    on 02/01/30, Mathieu Bouchard <matju / sympatico.ca> writes:

|Object#become is not an essential feature, but the same can be said of
|#callcc and retry... somewhere a line has to be drawn. the question is
|"where?"...

It's both easy and hard question.  Easy answer is, as Hal Fulton
quoted in his book: "follow your heart".  Hard answer is .. well
.. it's too hard to say. ;-)

							matz.