reduce() is no longer part of python core, but we don't
need it actually - since we use remote configs, we have
no more required settings (otherwise we put them in remote).
And to quote the python docu as I found it interestingly
proving my own impression of this code:
> Removed reduce(). Use functools.reduce() if you really need it;
however, 99 percent of the time an explicit for loop is more readable.
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