[ruby-talk:03058] FailureClass?

Question arising from the FAQ:

7.4 says:
We recommend that predicate methods (those whose name ends with a question
mark) return true or false. Other methods that need to indicate failure
should return nil.

While we are unloading the multiple meanings of nil (or like 0 in C as null
and false and... :) shouldn't we do it to the full extent at once by
introducing FailureClass and mentioned routines should return a failure
(instance FailureClass).

Then nil would have only (?) the meaning undefined or unspecified.

	- Aleksi