Maciek Sakrejda <m.sakrejda@gmail.com> writes:
> V7 passes check-world here. But, just for kicks, I generated all
> possible 7-character sequences of Roman digits [1] to confirm whether
> everything either parsed cleanly or errored cleanly. Reviewing the
> output, I noticed that to_number accepts some dubiously-formatted
> values:
> postgres=# select to_number('mmmdcm', 'RN');
> to_number
> -----------
> 4400
> (1 row)
Ugh. This makes more urgent my question about where roman_to_int's
algorithm came from, because there's evidently something not right
about it.
regards, tom lane