[Moose-dev] Re: MSE Format, latest draft

Hi, The main use case in Magritte for the nil initial value is that you want to distinguish between something that is specifically set and something that is not. The same use case we would have for distinguishing between the case when a parser could not say about a class that it isAbstract and another case when it could say that it is not. The other use case is when we could not compute some metric for some reason. I think, these are good use cases. On the other hand, I do not like that a Boolean can have 3 values because this hinders later on the queries and proliferates guard conditions (which is a pain). So, if we take this road, then I would like to have an ExtendedBoolean and an ExtendedNumber that deal with the special cases. But, somehow I would rather go for the simplest case when we do not allow such undecided values, because this puts more pressure on the parsers to produce better results. Doru On Dec 8, 2007, at 5:03 PM, Lukas Renggli wrote: -- www.tudorgirba.com www.tudorgirba.com/blog "It's not what we do that matters most, it's how we do it."