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Form validation: blank fields bug?

When I tried to extend the form validation library to add some validation of my own, I encountered some unexpected behaviour: my new validation rules only seem to get called on fields that are not left blank.

I initially thought my code was doing something stupid (I'm quite new to CodeIgniter) and made a topic in the code and application forums, but no one there could find a problem in my code. So, I was wondering if this might be a bug in the form validation library?

The full topic with my sample code in it can be found here.

Validation rules are never called on blank fields, unless you define the field as 'required'.

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