What do you mean by "short circuit"?
It means that the part after || will only be evaluated if it is needed know the result of the operator. In the case of the or-operator the second half is redundant if the first is true, since the total will be true no matter what the second part is.

In reply to Re^3: Zeckendorf representation by lidden
in thread Zeckendorf representation by thmsdrew

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