#12313: Fix yet another memory leak caused by caching of coercion data
--------------------------------------------------------+-------------------
       Reporter:  SimonKing                             |         Owner:        
                                               
           Type:  defect                                |        Status:  
positive_review                                      
       Priority:  major                                 |     Milestone:  
sage-5.8                                             
      Component:  memleak                               |    Resolution:        
                                               
       Keywords:  coercion weak dictionary              |   Work issues:        
                                               
Report Upstream:  N/A                                   |     Reviewers:  Simon 
King, Jean-Pierre Flori, John Perry, Nils Bruin
        Authors:  Simon King, Jean-Pierre Flori         |     Merged in:        
                                               
   Dependencies:  #715, #11521, #12215, #13746, #13378  |      Stopgaps:        
                                               
--------------------------------------------------------+-------------------

Comment (by jpflori):

 Oops, I'm deeply sorry, I thought I was posting on #12215.

 And I'm indeed aware that #12215 was merged in beta1 and that the tests
 pass on it, but the backtrace suggests at first sight at least that #12215
 has something to do with that.

 Hopefully, we only need a simple fix for GroebnerStrategy objects as we
 did in #11521 (IIRC).
 Indeed the new crashes seem to involve similar objects but in different
 files from before.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12313#comment:309>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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