Issue #2854543 by Wim Leers, polynya, dawehner, mpdonadio, gabesullice, larowlan, klausi: NegotiationMiddleware calls $request->setRequestFormat('html') when there is no _format request parameter, but shouldn't

Issue #2854543 by Wim Leers, polynya, dawehner, mpdonadio, gabesullice, larowlan, klausi: NegotiationMiddleware calls $request->setRequestFormat('html') when there is no _format request parameter, but shouldn't

Issue #2883680 by dawehner, Wim Leers, tim.plunkett, larowlan: Force all route filters and route enhancers to be non-lazy

Issue #2854560 by Wim Leers, boaloysius, dawehner: \Drupal\Core\Routing\RequestFormatRouteFilter::filter() is too HTML-centric

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2481453 by dawehner, pwolanin, rteijeiro, neclimdul, znerol: Implement query parameter based content negotiation as alternative to extensions