[Python-ideas] Re: NAN handling in statistics functions

[Mark Dickinson]

Returning a NaN by default has the advantage of being consistent with IEEE 754 
semantics for sequence-based operations (like `sum` and `dot`) and with 
existing Python `math` module functions like `fsum`, `prod` and `hypot`. In 
IEEE 754, the majority of operations silently return a NaN (not signalling any 
floating-point exception) when given a NaN as input.
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