You have float or integer fields and have a standard edit form to edit those.
If you enter any text hello into those float or integer fields, Atk4/Ui will validate them as OK, and Atk4/Data will store them as if you had typed in 0.

This is dangerous and wrong.

Any number field should not accept wrong text, otherwise type validation does not make any sense.

Expected behaviour:
Any number field should throw a ValidationException if it cannot correctly interprete the input value. Interpreting this as 0 if the user has another intention is dangerous.