title: Does Gson have something like WRITE_NULL_MAP_VALUES (Jackson)?
body: <p>Looking at this: <a href="http://jackson.codehaus.org/1.6.5/javadoc/org/codehaus/jackson/map/SerializationConfig.Feature.html" rel="nofollow">http://jackson.codehaus.org/1.6.5/javadoc/org/codehaus/jackson/map/SerializationConfig.Feature.html</a></p>
  
  <p>It looks like jackson json has a configuration in which only maps will have their null values serialized, but Gson only appears to have serialization of all null values, or none at all</p>