What does the following code do?

use Acme::Tools;

# num2code() can be used to compress numeric IDs to
# something shorter:
$chars='0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
+-_';
$code=num2code("241274432",5,$chars);

[download]
it produces the following output: EOOv0

I don't understand it...

In reply to acme::tools num2code function by cztmonk

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