doctrine/dbal — pull request #569 by BenMorel (2014-04-17 15:44:52+00:00)
Title: Fixed type and initialization value of $_nestTransactionsWithSavepoints

`Connection::$_nestTransactionsWithSavepoints` is definitely a `boolean` and not an `integer`, and the rest of the code assumes it's `false` by default, whereas it's actually `null` right now. Which still works as `null` evaluates as `false`, but is not clean.