Mark OCI8Statement::convertPositionalToNamedPlaceholders() internal

UPGRADE.md

 # Upgrade to 2.11
 
+## Non-interface driver methods have been marked internal
+
+The non-interface methods of driver-level classes have been marked internal:
+
+- `OCI8Statement::convertPositionalToNamedPlaceholders()`
+
 ## Inconsistently and ambiguously named driver-level classes are deprecated
 
 The following classes under the `Driver` namespace have been deprecated in favor of their consistently named counterparts:

lib/Doctrine/DBAL/Driver/OCI8/OCI8Statement.php

@@ -133,6 +133,8 @@ class OCI8Statement implements IteratorAggregate, StatementInterface, Result
      * Question marks inside literal strings are therefore handled correctly by this method.
      * This comes at a cost, the whole sql statement has to be looped over.
      *
+     * @internal
+     *
      * @param string $statement The SQL statement to convert.
      *
      * @return mixed[] [0] => the statement value (string), [1] => the paramMap value (array).