SqlServer: Store JSV objects in VARCHAR(MAX) columns

Store JSV objects in VARCHAR(MAX) columns, same as VARCHAR(8000), but is stored as blob if bigger than 8000 chars. So no problem storing huge dictionaries etc.

Very little performance penalty, see
http://www.simple-talk.com/sql/database-administration/whats-the-point-of-using-varchar%28n%29-anymore/