#13378: Do not cache the non-existence of coerce/convert map too often, and do 
not
pretend that there is a conversion where it doesn't make sense at all
----------------------------------------------------+-----------------------
       Reporter:  SimonKing                         |         Owner:  robertwb  
     
           Type:  defect                            |        Status:  
positive_review
       Priority:  major                             |     Milestone:  sage-5.7  
     
      Component:  coercion                          |    Resolution:            
     
       Keywords:  coercion conversion object cache  |   Work issues:            
     
Report Upstream:  N/A                               |     Reviewers:  Nils 
Bruin     
        Authors:  Simon King                        |     Merged in:            
     
   Dependencies:  #12313, #12215                    |      Stopgaps:            
     
----------------------------------------------------+-----------------------

Comment (by jdemeyer):

 I guess it's a matter of definitions.  I consider "merge with" as an
 equivalence relation (symmetric and transitive).  Given that #12313 is to
 be merged with #13378 and #12215 is to be merged with #12313, the logical
 conclusion is that these 3 tickets need to be merged together.  I didn't
 use the phrase "merge with" here, only to make the order of merging more
 clear (first #12215, then #12313, then #13378).

 > no need to repeat that dependence here.
 I find it easier to have the full set of dependencies written down.
 Consider tickets A, B and C where A and B have positive review, C needs
 review, A depends on B and B depends on C.  If the implicit dependency of
 A on C is not written down, then it's not obvious to the release manager
 that A cannot currently be merged.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13378#comment:24>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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