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Line 204: Line 204:
 
  if (not (isa (y, "infsupdec")))
 
  if (not (isa (y, "infsupdec")))
 
   y = infsupdec (y);
 
   y = infsupdec (y);
 +
endif
 +
* Methods of class <code>infsupdec</code> as well as methods of class <code>infsup</code> that are not overridden by <code>infsupdec</code> must check parameters using the <code>isnai</code> function and return the NAI value if it is present. This will propagate NAI values through any function evaluations.
 +
if (isnai (x))
 +
    result = x;
 +
    return
 
  endif
 
  endif
  

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