[m-rev.] for review: subtypes

[Mark Brown]

Hi everyone,

I have had a shot at implementing something along the lines of the old
subtypes proposal. It is for review by anyone. The log message is
attached, and the diff can be found at

https://github.com/markbrown/mercury/

in the subtypes branch. Please note I am not currently subscribed to this list.

Merry Christmas :-)

Cheers,
Mark.
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