Regression in Qt5 Beta1 in QSqlQuery::bindValue() and bool param - uncorrect binding in some cases

CREATE TABLE `testbug` (
    `id` INT NOT NULL AUTO_INCREMENT,
    `number` INT,
    `flag` BOOL NOT NULL DEFAULT FALSE,
    PRIMARY KEY(`id`))
ENGINE=InnoDB DEFAULT CHARSET=utf8;

#include <QtSql/QSqlDatabase>
#include <QtSql/QSqlError>
#include <QtSql/QSqlQuery>
#include <QtCore/QVariant>

class Core {
public:
    void run();
    QSqlDatabase db;
};

int main()
{
    Core core;
    core.run();
    return 0;
}

void Core::run()
{
    db = QSqlDatabase::addDatabase("QMYSQL");
    db.setDatabaseName("test");
    db.setHostName("localhost");
    if(!db.open()) {
            qFatal("%s", qPrintable(db.lastError().databaseText()));
            return;
    }

    for(int i = 0; i < 20; ++i) {
        bool flag = i % 2;
        QSqlQuery q;
        q.prepare("INSERT INTO testbug (`number`, `flag`) VALUES(:number, :flag)");
        q.bindValue(":number", i);
        q.bindValue(":flag", !flag);
        if(!q.exec())
            qWarning("%s:%d %s", Q_FUNC_INFO, __LINE__, qPrintable(q.lastError().text()));
    }
}

+----+--------+------+
| id | number | flag |
+----+--------+------+
|  1 |      0 |  127 |
|  2 |      1 |  127 |
|  3 |      2 |  127 |