QueryBuilder: added type checks
QueryBuilder: added type checks

Mikulas/dbal,nextras/dbal,Mikulas/dbal,dyamon-cz/nextras-dbal,dyamon-cz/nextras-dbal,nextras/dbal,jasir/dbal,jasir/dbal,jasir/dbal,nextras/dbal,dyamon-cz/nextras-dbal,Mikulas/dbal