Also, while 3 valued logic is great, it isn't supported that well in Java (until Some/None/Option in Java 8, which helps some).
jclouds is quite fond of Guava's Optional, but at the API level we mainly use it to allow access to extension APIs that are, well, optional.
I'd agree that we don't really want Optional<...> as a return type for API calls that return a primitive value.
Thanks for the input, Martin! ap
