[tex-k] incorrect simplification of alpha assignment in mf

[Karl Berry]

Hi Tim and all - over three years later, but I finally removed the
incorrect change in mf.ch that you found (in TL r72839):
@x
  alpha:=take_fraction(take_fraction(major_axis,
..

I also put your test file in the pile for Knuth to consider as an
addition to trap.mf.

tracingpens:=1;
pickup pencircle xscaled 37 yscaled 11 rotated 70;
end;

Your original report, for reference:
https://tug.org/pipermail/tex-k/2021-August/003648.html

Perhaps someone will be interested enough to see if there is any change
to existing mf font rasterizations as a result. Presumably/hopefully,
any such changes will be tiny ... --thanks, karl.