[CDBI] Deep recursion from before_create trigger

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I want to do data normalization in before_create trigger. So I access
columns such as $self->title() and normalize the value (if it exists).
The infinite loop arises when that column has not in fact been set --
I'm guessing bc CDBI then wants to fetch it from the DB, but it
doesn't exist yet ... although I don't really understand that.

Anyhow, it is fixed by using $self->{title} instead, but this seems
ugly and leaves me nervous. I'd like to understand what's going on and
whether it's a bad idea to do this kind of work in the trigger...
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