Top runtime issues

System.Text.Json fails on deserializing into sub-subclasses of system collections

area-System.Text.Json bug

Make mutable generic collection interfaces implement read-only collection interfaces

area-System.Collections

System.DateTimeOffset Property - StartTimeOfDay

api-suggestion area-System.Runtime

Enable Git LFS and merge the corefx-testdata repo with corefx

area-Infrastructure-libraries

Improve test coverage for JsonElement (when backed by JsonNode) for edge cases around enumeration

area-System.Text.Json easy test enhancement

HTTP2: Canceling token given to HttpClient.SendAsync does not send RST_STREAM

area-System.Net.Http tenet-reliability

[System.Text.Json] Support Dictionary<int, T>

area-System.Text.Json json-functionality-doc

System.Text.Json: Custom Constructor Support

area-System.Text.Json enhancement

Question: Has dynamic and emit execution performance been improved?

area-System.Reflection.Emit question

System.Text.Json throw exceptions on UWP in Release Build

area-System.Text.Json