From: antispam@fricas.org   
      
   Terje Mathisen  wrote:   
   >>> This would have simplified all sorts of array/matrix sw where both   
   >>> errors (NaN) and missing (None) items are possible.   
   >>   
   >> In what ways would None behave differently from SNaN?   
   >   
   > It would be transparently ignored in reductions, with zero overhead.   
      
   In matrix calculations I simply padded matrices with zeros.   
      
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