Ed Hennis 64cb53629d Rework subtraction rounding (again) for more accuracy ...

- Go back to the old method of computing the mantissa, but when post
  processing, expand the mantissa to slightly larger than maxMantissa,
  then in doRoundDown, if the result is not exact, subtract one.
  Finally, let doNormalize figure out the rounding of the result.

2026-06-11 19:37:55 -04:00

..

xrpl

Rework subtraction rounding (again) for more accuracy

2026-06-11 19:37:55 -04:00