LinFu proxy cannot be created on an entity that has a method with out parameter "public virtual int DoStuff(out string answer)"

Entity with a method with an out parameter, cannot be proxied.

Also, the exception doesn't give good information:

outer:
NHibernate.HibernateException: Creating a proxy instance failed

inner:
System.ArgumentNullException: Value cannot be null.Parameter name: type

The below code is the failing example. Removing the out parameter makes it work

father entity:

public class Department
{
public virtual int Id { get; set; }
public virtual IDictionary<int,Employee> Employees {get;set;}

public virtual void OutParametersMethod(out string outString)
{
outString = "";
}
}

the child:

public class Employee
{
public virtual int Id { get; set; }

public virtual Department Department { get; set; }
}

The mapping of the many to one (in Employee.hbm.xml) (is trivial):

<many-to-one name="Department" class="TestVSOracle.Entities.Department, TestVSOracle"
column="DEPARTMENT_ID" not-null="false" lazy="proxy"/>