Stefan Krah added the comment:

I've left comments on GitHub.


[scoder] 
> As I said, where ever exact calculations are needed..

Even if the formatting comment is addressed, the main problem with
this benchmark is that *both* fraction and decimal calculations
are in fact exact here.

You can check that by printing out the values for "t" in the loop
like I suggested on GitHub.


This is of course one of the main features of Decimal: If you're
willing to take the penalty of a large precision, calculations
can often be exact; similar to taking the penalty of potentially
huge numerators and denominators in fractions.


So this benchmark cannot be used to show the superiority of exact
fractions.

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