40089 Diagrams and samples for Rank 20-30 popular api docs (cla: yes, d: api docs, d: examples, f: material design, framework, from: study)

40099 Fix double.infinity serialization (cla: yes, framework)

40100 Fix a problem with disposing of focus nodes in tab scaffold (cla: yes, f: cupertino, framework)

40102 Lower the iterations on flutter_gallery__back_button_memory (cla: yes, team)

40105 Ensure frame is scheduled when root widget is attached (cla: yes, framework)

40112 Revert engine roll (cla: yes, engine)

40117 Show outdated CocoaPods version in hint text (cla: yes, t: flutter doctor, tool, waiting for tree to go green)