Prototype is an excellent tool but lacking in documentation, causing me to fumble around and *gasp* look at the source code. As any developer knows, when reviewing code there is a chance that you may miss something or ignore what doesn't seem interesting. In doing so, you may miss some sweet features that you would otherwise use.
The decay option allows you to give your server a bit of a break if it's returning a lot of identical responses. Essentially, every time PeriodicalUpdater makes a request, it compares the results with what the server returned last time. If the values are the same, it multiplies the interval by the decay value. So, for the above example, it would make the next request two seconds later, then four seconds later, and so on, until it received a different result from the server. At that point, the interval would be reset to one second.
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