Inconsistent doc in example and website

    # Create your Flask-SQLALchemy models as usual but with the following two
    # (reasonable) restrictions:
    #   1. They must have an id column of type Integer.

ref: https://flask-restless.readthedocs.org/en/latest/quickstart.html

     They must have a primary key column of type sqlalchemy.Integer or type sqlalchemy.Unicode.
ref: https://flask-restless.readthedocs.org/en/latest/basicusage.html

Is my assumption is right that Unicode is also valid id?