On Thu, 2020-05-28 at 22:07 +0200, Jouke Witteveen wrote: > Here is a thought: The current support for numeric variables is > limited to unsigned numbers. We could choose to stick with that!
I'm not sure how this would work... it works today because we have no subtraction and all numbers make can generate are always positive, but if you allow subtraction then you have to decide what to do with negative numbers. I guess we could throw a fatal error. Seems pretty harsh! :) > Note that when LIST is empty, addition and subtraction should yield > "0", while multiplication and division should yield "1". I think this needs to be defined but there are two ways to do it. And in addition to the empty list, you need to decide what to do about a unary list (list with only one value). In one of my earliest messages on this list I suggested as you do here, that we use the identity function for the operator. This boils down to saying that the initial value of the accumulator for the math function is 0 for addition/subtraction and 1 for multiplication/division. Then I had another thought, that always using 0 might be useful in some situations... but I was thinking specifically of multiplication: obviously that won't work for division. So, I think the identity function is the right choice.
