On the other hand, in a separate english-language specification you could say that a certain thing is unspecified and leave it up to the implementation to decide on a certain behaviour. I have been reading a bit in the scheme report (that's a specification right?) and there are a certain number of unspecifications in there.
i don't arc is intended to have more than one implementation, or at least more than one popular implementation. if this is the case, nothing is unspecified. whatever the implementation does, that is the language.
