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Reproduced with Sierra build 20071218-2059. Addition function can have more than 2 inputs while the number of inputs of Multiplication is 2.
It is just according to the XPath specification http://www.w3.org/TR/xpath#numbers
It is my misunderstanding that the multiplication can have only 2 operands according the specification. So I reopen the issue.
Changed target milestone from Sierra to 6.1 in order to display correct info on NB 6.1 dashboard