Issue #2594473 by Torenware, quietone: The StreamWrapperManager class returns non-strings for getNames and getDescriptions

Issue #2605664 by Torenware, Mile23, alexpott, Taran2L, neclimdul, Yogesh Pawar, mark.creamer, donquixote, dawehner, klausi: Align TestDiscovery and bootstrap.php's non-permissive loading of PSR-4 namespaces for traits

Issue #2575725 by alexpott, lokapujya, rajeshwari10, Torenware, andrewbelcher, pashupathi nath gajawada, jonathan1055: Uncaught PHP Exception when selecting too many PHPunit tests in UI

Issue #2658438 by kristiaanvandeneynde, Torenware, dawehner, alexpott: Array valued 'extra' values generate invalid SQL in Views joins

Issue #2709581 by Torenware, pepegarciag, jhodgdon: Better explain the $modules variable in kernel tests

Issue #2583135 by Torenware, klausi: Context::getContextData() sometimes returns NULL which violates ContextInterface