But when I try 3^31 (which is less than 2^52) and subtract 3^31-1, 3^31-2, 3^31-3 (resp. 1, 2 and 3
less than 3^31) I don't get 1, 2 and 3 as result, but 0, 0 and 3.
This test is simply in Calc with e.g. =(3^31)-((3^31)-1).
That's due to approxSub() being used for operator '-', which lessens the
available precision. approxEqual() needs to be reworked to not scale in
such cases.
I'll investigate.
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