bug#5114: 23.1.50; (string-to-number (number-to-string most-positive-fixnum))

[Lars Magne Ingebrigtsen]

Helmut Eller <eller.helmut@gmail.com> writes:

> (setq x (string-to-number (number-to-string most-positive-fixnum)))
> (= most-positive-fixnum x) => nil
>
> x is 2305843009213693440 but it should be most-positive-fixnum
> which is 2305843009213693951.
>
> The test
> (= most-positive-fixnum 
>    (string-to-number (number-to-string most-positive-fixnum)))
> seems to work as expected on 32-bit machines but not so on 64 bit.

I'm unable to reproduce this on Emacs 24, so I think it's likely that
this has been fixed by all the numerical fixes that have been applied
the last year.

-- 
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  bloggy blog http://lars.ingebrigtsen.no/