Github user LosD commented on the issue:
https://github.com/apache/metamodel/pull/128
While not a super example, since there's not really a general math library
with an average, but most of them go pretty far not to change type on you, and
I would certainly expect the same with an average. Especially since you can't
predict the same result of a float average casted to an int, as of an int
average. Even worse if you have decimals and want to make an average of them
since you wouldn't use decimals if you didn't care about precision and
predictably in the first place.
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