If I read the code correctly, this is a Perl implementation of this, of which is claimed:

THIS IS THE BEST KNOWN RANDOM NUMBER GENERATOR AVAILABLE.
...
It passes ALL of the tests for random number generators and has a period of 2^144, is completely portable (gives bit identical results on all machines with at least 24-bit mantissas in the floating point representation).

so if you are looking for a deterministic, long-period pseudo-random number generator, perhaps this is it.

- j