Some models (e.g. calendar.event), use "virtual" ids which are not represented
as integers. It was not possible to use sorted method on those models as calling
int() is failing.
This commit fixes the method, making it agnostic to the type of the
'id' member variable.
Fixes#7454
The onchange handler is doing a weak comparison between the values received from
the onchange() method and the current field value, which leads to a falsy value
such as "0000" being treated as equal to False.
This patches changes the operator to enforce non-coercive equality.
Fixes#6405
andreparames