#715: Parents probably not reclaimed due to too much caching
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       Reporter:  robertwb                                         |         
Owner:  somebody                                 
           Type:  defect                                           |        
Status:  needs_work                               
       Priority:  major                                            |     
Milestone:  sage-5.4                                 
      Component:  coercion                                         |    
Resolution:                                           
       Keywords:  weak cache coercion Cernay2012                   |   Work 
issues:  Fix __delitem__                          
Report Upstream:  N/A                                              |     
Reviewers:  Jean-Pierre Flori, Simon King, Nils Bruin
        Authors:  Simon King, Jean-Pierre Flori                    |     Merged 
in:                                           
   Dependencies:  #9138, #11900, #11599, to be merged with #11521  |      
Stopgaps:                                           
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Changes (by SimonKing):

  * status:  positive_review => needs_work
  * work_issues:  => Fix __delitem__


Comment:

 On #12313, I found that the `TripleDict.__delitem__` method needs to be
 fixed, because it does currently not update the `_refcache` dictionary.
 So, I'd say I fix this here, which means that it needs work and needs
 another review.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/715#comment:210>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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