#19514: fix hash in universal cyclotomic field
------------------------+-------------------------------------
   Reporter:  chapoton  |            Owner:
       Type:  defect    |           Status:  new
   Priority:  major     |        Milestone:  sage-6.10
  Component:  algebra   |         Keywords:
  Merged in:            |          Authors:  Frédéric Chapoton
  Reviewers:            |  Report Upstream:  N/A
Work issues:            |           Branch:
     Commit:            |     Dependencies:
   Stopgaps:            |
------------------------+-------------------------------------
 Zero does not hash there to zero, contrary to many other rings.
 {{{
 sage: hash(UniversalCyclotomicField().zero())
 3713081631936575706
 sage: hash(ZZ(0))
 0
 sage: hash(QQ(0))
 0
 }}}

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Ticket URL: <http://trac.sagemath.org/ticket/19514>
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