A small problem to think about:
Maybe Maybe Integer
Should 't1 := wrap(failed()$Maybe Integer)' equal to
't2 := failed()$Maybe Maybe Integer'
Logically speaking, 'failed?(t1)' is false because t1 is
a Maybe(Integer) valued being wrapped. And 'failed?(t2)'
is true so they are not equal.
Current implementation of Maybe and Union("failed",...)
both think 't1=t2' is true.
Again, I think this is a small problem, because
1. there's no point of using Maybe(Maybe(XXX)).
2. thinking "failed" as a universal thing is understandable.
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