ParcPlace-Digitalk VSE 3.1 (roughly 1999):

(0 to: 1) = (0 to: 5/3). "true"

(0 to: 1) hash = (0 to: 5/3) hash. "true"

So, ancient VSE and current VisualWorks are consistent, and agree on where they want to be. This is also the direction I want to take Squeak.

VA is also consistent, but #= doesn't match any other Smalltalk varient that we've looked at.

Squeak, Pharo, Dolphin all currently have the same answer, but are not consistent.

Interesting indeed.

thanks,

cbc

On Thu, Nov 1, 2018 at 5:40 AM Louis LaBrunda <Lou@keystone-software.com> wrote:

Hi Benoit,

On the latest version of VA Smalltalk:

VA Smalltalk V9.1 (32-bit); Image: 9.1 [413]
VM Timestamp: 4.0, 10/01/18 (100)

I see:

(0 to: 1) = (0 to: 5/3). "false"
(0 to: 1) hash = (0 to: 5/3) hash. "true"

Very interesting.

Lou

On Thu, 1 Nov 2018 02:40:00 +0000 (UTC), Benoit St-Jean via Squeak-dev <squeak-dev@lists.squeakfoundation.org> wrote:

>Interesting!
>
>As a comparison:
>Squeak 5.2
>(0 to: 1) = (0 to: 5/3). "true"(0 to: 1) hash = (0 to: 5/3) hash. "false"
>Dolphin 7(0 to: 1) = (0 to: 5/3). "true"(0 to: 1) hash = (0 to: 5/3) hash. "false"
>VisualWorks 8.1.1(0 to: 1) = (0 to: 5/3). "true"
>(0 to: 1) hash = (0 to: 5/3) hash. "true"
>Pharo 5.0(0 to: 1) = (0 to: 5/3). "true"
>(0 to: 1) hash = (0 to: 5/3) hash. "false"
>
>I don't have VAST installed on the PC I'm using right now. I'd be curious to see how other Smalltalk and/or GemStone handle this? So far (according to what I could test, only VW is right (according to the ANSI standard and just plain logic!)
>
>I wonder how much code relies on this "behavior" out there!
>But the ANSI Smalltalk draft is very clear on this (revision 1.9, page 53, http://wiki.squeak.org/squeak/uploads/172/standard_v1_9-indexed.pdf):
>"If the value of receiver = comparand is true then the receiver and comparand *must* have equivalent hash values."
>That's what I always thought (or was taught or even read in the Blue Book). Was this something that was changed at some point???
>
>----------------
>Benoît St-Jean
>Yahoo! Messenger: bstjean
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>"A standpoint is an intellectual horizon of radius zero". (A. Einstein)
--
Louis LaBrunda
Keystone Software Corp.
SkypeMe callto://PhotonDemon