Add a note about FF 3.1b1's incomplete string serialization.
Add a note about FF 3.1b1's incomplete string serialization.

yetone/json3,yetone/json3,jcoc611/cassandraMAP,cyril-sf/kamino.js,mcanthony/json3,mcanthony/json3,jcoc611/cassandraMAP,oyvindkinsey/json3,bestiejs/json3,bestiejs/json3,tildeio/kamino.js