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Date: Fri, 17 Feb 2006 13:09:26 +0200
To: "Stefan Walk" <stefan.walk@gmail.com>
Cc: "Sara Golemon" <saramg@berkeley.edu>,internals@lists.php.net,
	"Andi Gutmans" <andi@zend.com>
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Subject: Re: [PHP-DEV] Re: Minor engine patch to facilitate
	PECL/operator
From: zeev@zend.com (Zeev Suraski)

At 11:55 17/02/2006, Stefan Walk wrote:
>On 16/02/06, Zeev Suraski <zeev@zend.com> wrote:
> > In languages where operator overloading is supported, it comes hand
> > in hand with strict typing, which wouldn't allow for different values
> > for x>y and y<x...
> >
> > Zeev
>
>That's not true, Ruby for example has operator overloading, and has no
>problems with different meanings of x>y and y<x (but i don't know a
>core class that does that).

I mean *real* languages :)  Seriously though, it sounds like a bad 
idea to allow it.

>Also, PHP already breaks the transitivity rule for the equality
>operator ($a == $b and $b == $c does not imply $a == $c), so there's
>not much new evil if a user can, by loading an extension, break the
>symmetry of the comparison operators, IMO.

Oh I disagree.  While we do have some unique cases in which 
transitivity is not maintained, they are quite, well, unique, and 
arguably make sense.
More importantly, the discussion here is not about transitivity 
(although it does have transitivity implications).  It's more 
fundamental, it's about the very meaning of smaller-than / 
greater-than and the relationship between them.

Zeev