#12020: bug in zero_matrix rewrite in matrix_space.py
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   Reporter:  was             |          Owner:  jason, was                    
       Type:  defect          |         Status:  needs_review                  
   Priority:  blocker         |      Milestone:  sage-duplicate/invalid/wontfix
  Component:  linear algebra  |       Keywords:                                
Work_issues:                  |       Upstream:  N/A                           
   Reviewer:                  |         Author:  William Stein                 
     Merged:                  |   Dependencies:                                
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Comment(by was):

 The fix for #12000 also works for this particular example.    I really
 hope that all other matrix types (now and in the future) respect this None
 convention, since they will all have the same problem if we go with the
 #12000 fix rather than the fix here.  We could add documentation in the
 file matrix/docs.py that reflects what should happen with None, and we
 should try to add a test that things work with several different types.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12020#comment:10>
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