People wrote about toRational (0.9) == 9%10 = False
...
Probably, the source of a `bug' is a language agreement that the
input is in decimal representation (`0.9') and its meaning is a
floating approximation in _binary_ representation.
For example, 1%5 yields a finite mantissa in decimal representation
and an infinite (periodic) mantissa for the binary representation of
toBinary(1%5) = 1B % 1001B.
Therefore applying toRational to any finite float approximation
(Double, or other) of 1%5 does not return 1%5.
- ?
-----------------
Serge Mechveliani
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