Just some on-topic humor to lighten the mood (thanks to Harald Schilly on 
G+):

[vbraun@volker-desktop ~]$ js
js> print({})   // empty object
[object Object]

js> {} + {}
NaN

True since its definitely not a number!



On Thursday, December 20, 2012 12:35:05 PM UTC, Volker Braun wrote:
>
> It is common practice to encode missing/invalid data points as NaN

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