@Override
    public Class<? super Object> typeClass()
    {
        return Object.class;
    }
Will be used if {@link RuntimeEnv#POJO_SCHEMA_ON_COLLECTION_FIELDS} is enabled and the
field is assignable from Collection.

@author David Yu
@created May 19, 2016
protostuff-runtime/src/main/java/io/protostuff/runtime/PolymorphicPojoCollectionSchema.java