@Override
    protected <T> void writeTo(OutputStream out, T message, Schema<T> schema) throws IOException
    {
        JsonIOUtil.writeTo(out, message, schema, isNumeric());
    }
Test runtime collection fields with {@link CollectionSchema} via json ser/deser.

@author David Yu
@created Jan 27, 2011
protostuff-json/src/test/java/io/protostuff/AbstractJsonRuntimeCollectionSchemaTest.java