After calling load() or loadNB(), any property without an explicitly saved value retains its "dirty" value

After a call to load() or loadNB(), the value of all properties should equal that of a freshly created and loaded properties manager. Currently however, if a value is set to a property which has the default value without any explicit value in the properties file, after load() the non-default value is returned.

The problem is that load() does not clear the properties so anything that is not explicitly set in the file retains its current value.