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Checksums (was re: 8r fonts)

Piet Tutelaers writes:
 > > (1) what happens if WX is non-integer (as it is in all CM, AMS etc fonts
 > >   --- or at least if it isn't fractional then you do not have good
 > >   fonts!)?
 > Non-integers are currently *not* supported. They were not foreseen by Tom
 > Rokicki. Perhaps Berthold wants to learn us why we need them "uberhaupt?

Fontinst supports them, but only by brute force truncation after the
decimal point.  They were introduced by Adobe at the same time as MM
fonts, and I suspect that that's not a coincidence!  MM AFMs are
generated by interpolating, so it's not surprising you need
non-integer AFM values.