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'

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.