Refinements for sealed types

[Brian Goetz]

>> There are several ways to reduce the ceremony
>> - implicit declaration of sealed subtypes if the super type is sealed
>> - implicit declaration of permit clauses
>> and we may want to choose one, the other or both.

For the record, there is also a third possible way: inferring `extends X`. I don’t particularly love it, especially as it is mutually exclusive with inferring the permits clause.  But I include it for completeness.
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