> the usual kernel-interface stability and back-compatibility we
> normally strive very hard to maintain (eg, binaries from 0.8 still
> run)

Well...some of them.  I was rather unpleasantly surprised to find that
one of my tools didn't work as a 1.x binary under 2.0.  (Turned out
that nonexecutable stack was imposed willy-nilly, even when running
compatability binaries.  Worse, nobody seemed to think this was a bug.)

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