Bug fix: the instance 'Dao.Interpreter.Executable' for
'Dao.Interpreter.ObjTestExpr' was not dereferencing the test
expression, so the reference being tested was always a reference
value. This has been fixed.
Put the finishing touches on my example program
"examples/numbers.dao". You can now convert words to numbers, and
numbers to words. The previous result is remembered and can be
converted back and forth between numbers and words indefinitely.