#8119: Rename change the hash value of some objects
----------------------+-----------------------------------------------------
   Reporter:  hivert  |       Owner:  tbd
       Type:  defect  |      Status:  new
   Priority:  major   |   Milestone:     
  Component:  misc    |    Keywords:     
     Author:          |    Upstream:  N/A
   Reviewer:          |      Merged:     
Work_issues:          |  
----------------------+-----------------------------------------------------
 For many objects the hash value is computed from {{{__repr__}}}. This is a
 bad idea since renaming the object change its hash value.
 {{{
 sage: bla = PolynomialRing(ZZ,"x")
 sage: hash(bla)
 -1525918542791298668
 sage: bla.rename("toto")
 sage: hash(bla)
 2314052222105390764
 }}}

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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8119>
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