After a decade, it seems fair to reflect a little on what I have learned, what I managed to achieve, and maybe more significantly, what I did *not*. Something one learns very quickly upon beginning any serious work on programming languages is that they are startlingly, unforgivably *hard*. A vast array of dizzyingly smart people have been working on the problem of program specification for seventy years; there are not many pieces of low hanging fruit left on the tree, and any new gains tend to be very hard won.
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