From: Sam Roberts <sroberts@...>
Date: 2005-03-20T12:50:31+09:00
Subject: Re: how do you duck-type something to String, so String believes you?

Quoting lists@bertram-scharpf.de, on Sat, Mar 19, 2005 at 07:58:39AM +0900:
> Hi,
> 
> Am Samstag, 19. M�r 2005, 02:21:15 +0900 schrieb Sam Roberts:
> > Quoting flgr@ccan.de, on Tue, Mar 15, 2005 at 10:59:08PM +0900:
> > 
> >   class OneX; def ==(other); 1 == other; end; end
> >      => nil
> >   class UnityX; def ==(other); [1,1] == other; end; end
> >      => nil
> >   onex = OneX.new
> >      => #<OneX:0x32290c>
> >   unityx = UnityX.new
> >      => #<UnityX:0x31daec>
> >   [1,1] == unityx
> >      => false
> >   1 == onex
> >      => true
> > 
> > Huh? It always happens?
> 
> Fixnum and Float will call `other.== self' if they don't
> find one of their relatives.
> File `numeric.c', Function `num_equal()', line 806.

That's surprising, I expected Numeric to only do this if other#to_int or
other#to_float existed.

If doing it all the time is a good idea, why don't Array and String do
it that way?

Sam