WebSQL: Returned rows in SQLResultSetRowList immutable?

Question

I retrieved the rows from the WebSQL database and the returned rows look read-only.

    db.readTransaction(
        function(t1) {              
            t1.executeSql(
                "SELECT * FROM Foo WHERE id = ?",
                [1],
                function(t2, resultSet){
                    var foo = resultSet.rows.item(0);

                    console.log("before: " + foo.col1);
                    foo.col1 = "new value";
                    console.log("after: " + foo.col1);
                    console.log("sealed? " + Object.isSealed(foo));
                    console.log("frozen? " + Object.isFrozen(foo));
                }
            );
        }
    );

He prints:

    before: old value
    after: old value
    sealed? false
    frozen? false

I had to manually clone the string in order to be able to modify it.

How is this possible? How can I make an object unchanged without freezing or sealing? And where in the specification say it should be so?

---

UPDATE: This is ridiculous. This only happens in some tables. Still ignorant of it.

---

UPDATE 2: No, this happens in every table I read. Something seems to be related to Chrome (also happens in Opera, so this could be the behavior of a web kit).

Answer 1

-SQL SQLResultSetRowList SQLResultSet .