To add some detail, when values are passed to validators, the validator 
returns a tuple like (value, None) or (value, 'error message'), and the 
returned value can potentially be transformed by the validator (as in this 
case).

Anthony

On Wednesday, July 18, 2018 at 9:51:40 AM UTC-4, Leonel Câmara wrote:
>
> Nowadays I mostly use web2py's code as my documentation so I simply looked 
> at the code for IS_EMPTY_OR in:
>
> https://github.com/web2py/web2py/blob/master/gluon/validators.py
>
> Of course I already suspected the problem was there which just comes from 
> experience using and developing web2py.
>

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