@Override
            protected void transferValue(Pipe pipe, Input input, Output output,
                    int number, boolean repeated) throws IOException
            {
                output.writeObject(number, pipe,
                        strategy.POLYMORPHIC_POJO_ELEMENT_SCHEMA.pipeSchema,
                        repeated);
            }
For lazy initialization called by {@link RuntimeFieldFactory}.
protostuff-runtime/src/main/java/io/protostuff/runtime/RuntimeCollectionFieldFactory.java