I am also very happy that you got this figured out! I very seldom work with floats.
In my investigations, I found this: 
use Config;
# This should print 8 if on a 64 bit machine...
print $Config{nvsize},       " float size in bytes\n";

[download]
Might consider checking that as a sanity check that you are on 64 bit machine. I have no idea how to get Perl to do 64 bit floats on a 32 bit machine - but there is probably a way.

In reply to Re^9: Geo Package files by Marshall
in thread Geo Package files by Bod

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