Pynac hashes are restricted to 32 bits

[jdemeyer]

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 pynac/pynac#95

Upstream: Fixed upstream, in a later stable release.

CC: @rwst

Component: packages: standard

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/19310

[rwst]

Description changed:

--- 
+++ 
@@ -13,3 +13,5 @@
 sage: hash(SR(2^32))
 0
 ```
+
+See also https://github.com/pynac/pynac/issues/95

[rwst]

Dependencies: #19312

[rwst]

Upstream: Reported upstream. Developers acknowledge bug.

[rwst]

Changed upstream from Reported upstream. Developers acknowledge bug. to Fixed upstream, in a later stable release.

[rwst]

Changed dependencies from #19312 to pynac-0.5.4

[rwst]

comment:2

The fix will be in pynac-0.5.4. This ticket will provide some more doctests after the upgrade.

[jdemeyer]

Changed dependencies from pynac-0.5.4 to none

[jdemeyer]

Reviewer: Jeroen Demeyer

[jdemeyer]

comment:3

"Duplicate" of #19819.