Converting a Fraction to a Float is generally inexact. That's OK. Float
are inexact (rounded).
But that should not be the case for Fraction with 53bit numerator and
denominator power of two, as obtained with asExactFraction.
Unfortunately, current implementation of both Largeinteger>>asFloat and
Fraction>>asFloat will cause successive round off errors...
| x |
x := 0.510000001d-20.
^x asExactFraction = x
More over, denormalized number (gradual underflow) will convert back to
zero...
| x |
x := 1.1d-310.
^x asExactFraction asFloat = 0
Nicolas Cellier
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