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MySQL 8 no longer supports INT lengths. INT(11) as a field type for a 'id' field for example now throws a "Value exceeds required length for 'id'" error message on saving.
./modules/fuel/core/MY_Model.php line 2410 includes:
if ($field_data['type'] != 'float' AND $field_data['type'] != 'double') $this->validator->add_rule($field, 'length_max', lang('error_value_exceeds_length', $field_name), array($value, $field_data['max_length']));
This is now redundant for MySQL8 hosts and should be removed
Does changing that line to the following fix the issue for you?
Yes, it does seem to
I just pushed an update for that to the develop branch.