When initializing new Objects from XML, XStream overwrites int fields' default values when no values set in XML.

I have a class with default values set for fields (ints, Strings). I'm hoping that XStream would set only those fields which are defined in the XML.

When I load the XML, at least ints are set to 0 instead of their default value (-1). I haven't tested other primitives. Here's a small example of what happens now:

Class A:
// omitting getters/setters
class A {
private int threshold=-1;
String pattern=null;
}

XML
<a />

Loading with fromXML:

A a = (a)xstream.fromXML(xml);

Result:
a.threshold = 0 // should be -1
a.pattern = null // null is ok

I'm using XStream 1.2 with the DomDriver