Use Array.forEach instead of for...in

[onchainguy-btc]

Had the problem that in the application where I use this library all Array objects get enriched with some extra methods. So when using the for...in I always had the problem hat also these extra methods where added to the parameters array leading to a recursion problem in the end (like in #29 or #773). Would be great if you could merge this. I could also bring this to the browser version. Then we would need to check if the Array.forEach method is available before (e.g. IE8 does not have it).

[alechirsch]

I also had this issue #874, waiting for response