I noticed a quirk in 1.1alpha5.  If I use the Interpreter.set("name",null), the interpreter treats the variable as a undefined (void).  Is this on purpose?   I would think an Interpreter.unset() method might be more consistent.
It's not a big deal, but I wanted to have some pre-defined variables available to the scripts.  Sometimes, these are null.  I wanted the script writer to deal with basic Java syntax.