#19310: Pynac hashes are restricted to 32 bits
-------------------------------------------------+-------------------------
Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: packages: standard | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: Reported upstream. Developers | Work issues:
acknowledge bug. | Commit:
Branch: | Stopgaps:
Dependencies: #19312 |
-------------------------------------------------+-------------------------
Changes (by rws):
* dependencies: => #19312
* upstream: N/A => Reported upstream. Developers acknowledge bug.
Old description:
> `src/sage/symbolic/expression.pyx` claims
> {{{
> The hash of an object in Python or its coerced version into
> the symbolic ring is the same::
> }}}
>
> This is unfortunately not true since Pynac uses the 32-bit `unsigned`
> data type for hashes:
> {{{
> sage: hash(ZZ(2^32))
> 4294967296
> sage: hash(SR(2^32))
> 0
> }}}
New description:
`src/sage/symbolic/expression.pyx` claims
{{{
The hash of an object in Python or its coerced version into
the symbolic ring is the same::
}}}
This is unfortunately not true since Pynac uses the 32-bit `unsigned` data
type for hashes:
{{{
sage: hash(ZZ(2^32))
4294967296
sage: hash(SR(2^32))
0
}}}
See also https://github.com/pynac/pynac/issues/95
--
--
Ticket URL: <http://trac.sagemath.org/ticket/19310#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
