I've submitted a pull request as there's a bug dealing with the initialisation of the average.
If the value is 0, you're assuming it's uninitialised, but that's not true. A sequence of 0,0,0,0,0,0,1 is valid and should not have a final moving average of 1.
More generally, it's a really bad idea to encode information in numbers like this.
This is a special case of a digital filter where the weights are set to an exponential function. Apparently you can do things like tune for particular frequencies. It's a whole subfield in itself, but I found this a good introduction:
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[ 0.97 ms ] story [ 16.6 ms ] threadIf the value is 0, you're assuming it's uninitialised, but that's not true. A sequence of 0,0,0,0,0,0,1 is valid and should not have a final moving average of 1.
More generally, it's a really bad idea to encode information in numbers like this.
http://www.dspguide.com/pdfbook.htm