From: "Chr. Rippel" <chr_news@...>
Date: 2002-01-28T01:54:21+09:00
Subject: Re: Subrange of String subclass => invalid object

"Niklas Frykholm" <r2d2@acc.umu.se> wrote in,
....
> Foo.new('a').next.type   # => String
> f = Foo.new('a')
> f.next!
> f.type                   # => Foo
>
> This is a less serious, but on the other hand much more frequent

Yeah,  but if you really want to be consistent that would mean

 f.dup.type  # => Object

(if did not bother overriding #dup) a bit anal even for my taste ...

....
>
> Possible ways forward:
>
>  (a) "Require" that every object has a working #dup method. I.e., if

.... all reasonable

> end
   or (c) combine (a) and (b)
   module StringExtension
    def next; dup.next! end
  ...
   end

/Christoph