Method "ArrayAccess::offsetGet()" might add "mixed" as a native return type declaration in the future. Do the same in implementation "Knp\DictionaryBundle\Dictionary\Traceable" now to avoid errors or add an explicit @return annotation to suppress this message.
1x in ImportYamlTest::testLoadYamlConfig with data set "oberon" from App\Tests\Service
To get rid of this warning:
Method "ArrayAccess::offsetGet()" might add "mixed" as a native return type declaration in the future. Do the same in implementation "Knp\DictionaryBundle\Dictionary\Traceable" now to avoid errors or add an explicit @return annotation to suppress this message. 1x in ImportYamlTest::testLoadYamlConfig with data set "oberon" from App\Tests\Service