protected object ruby_dup(RBasic r, params object[] args)
{
RBasic dup = (RBasic)ruby.Funcall(r, "clone", null);
if (dup.GetType() != r.GetType())
{
throw new eTypeError("duplicated object must be same type");
}
if (dup.IsSpecialConst == false)
{
dup.klass = r.klass;
dup.flags = r.flags;
dup.Infect(r);
}
return(dup);
}