#13628: refactor xgcd
--------------------------------+-------------------------------------------
   Reporter:  saraedum          |             Owner:  AlexGhitza    
       Type:  task              |            Status:  new           
   Priority:  trivial           |         Milestone:  sage-5.5      
  Component:  basic arithmetic  |          Keywords:                
Work issues:                    |   Report Upstream:  N/A           
  Reviewers:                    |           Authors:  Julian Rueth  
  Merged in:                    |      Dependencies:  #13441, #13438
   Stopgaps:                    |  
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 Currently, some classes define a _xgcd method which is called by a xgcd
 method of euclidean domain elements. Most elements already define xgcd
 directly, and I see no real use in having this method in between.

 The attached patch renames all _xgcd methods to xgcd and also streamlines
 the use of @coerce_binop on them.

 This is similar to #13441.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13628>
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Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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