Comparing floats to Fractions gives unexpected results:

```
# Python 3.3
py> from fractions import Fraction
py> 1/3 == Fraction(1, 3)
False
```

but:

```
py> 1/3 == float(Fraction(1, 3))
True
```

I expected that float-to-Fraction comparisons would convert the Fraction to a float, but apparently they do the opposite: they convert the float to a Fraction:

```
py> Fraction(1/3)
Fraction(6004799503160661, 18014398509481984)
```

Am I the only one who is surprised by this? Is there a general rule for which way numeric coercions should go when doing such comparisons?