PATCH generated TypeHandler, Overly strict property/element ordering

When I create a JAXB object and only set some of the properties I can marshall
it without a problem, producing neat XML.

When I then try to unmarshal it I get an exception.

Apparently elements in the sequence must be set in that order, without
skipping any so that for

<element name="prop1">
<element name="prop2">
<element name="prop3">

An object created and marshalled after setting 2 properties
object.setProp1
object.setProp2

will work fine when unmarshalling.

While
object.setProp1
object.setProp3

will bomb since one was skipped.

To fix it the xxTypeHandler generated code needs to relax the check by changing

switch (__state) {
case 4:
__state = 5;

to

switch (__state) {
case 0:
case 3:
case 4:
__state = 5;

(As far as I can tell, that is)