[rt-users] auto-populate email from short username?

[Philip Brown]

On 05/28/13 01:00 PM, Kevin Falcone wrote:
> As mentioned earlier by my colleague, you can use
> http://bestpractical.com/rt/docs/latest/RT/User.html#CanonicalizeUserInfo-HASH-of-ARGS
> to massage the user data during creation.

Thanks for the reference.  However... that particular link seems to 
merely "reference" that the capability exists somehow. I cant' fathom 
how to use it.
Could you point me to any examples of how to actually use it, please?