GNU bug report logs - #32252
[PATCH] %o and %x now format signed numbers

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Message #124 received at 32252 <at> debbugs.gnu.org (full text, mbox):

From: Helmut Eller <eller.helmut <at> gmail.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 32252 <at> debbugs.gnu.org
Subject: Re: bug#32252: [PATCH] %o and %x now format signed numbers
Date: Thu, 26 Jul 2018 11:39:47 +0200

On Thu, Jul 26 2018, Paul Eggert wrote:

> Helmut Eller wrote:
>>> And prohibit %x on bignums? That would make little sense.
>> It would prohibit only negative bignums just like negative flonums are
>> forbidden.
>
> So under this proposal %x would generate ambiguous output once we add
> bignums? For example, on a 32-bit platform (format "%x" -1) would
> generate the same output as (format "%x" #x3fffffff), even though -1
> and #x3fffffff would be different integers? That doesn't sound like a
> good idea.

Indeed, had forgotten that case.

>>> Common Lisp and Scheme don't have any such prohibition; why should
>>> Emacs Lisp?
>>
>> Because Emacs Lisp was very successful without bignums.
>
> This appears to be more an argument against bignums than anything
> else. I've used Emacs Lisp without bignums for many years, and it's
> *always* been a hindrance. I would much rather have bignums, as they
> would make a lot of things simpler.

Well, it's an argument to promote the special role of fixnums.

Helmut

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