Top runtime issues

Add HashSet.CreateSetComparer(comparer)

api-needs-work area-System.Collections

CreateText always creates a new file while documentation says it creates OR opens

area-System.IO documentation

TypeInfo doesn't expose a parameterless constructor

api-approved area-System.Runtime

Referencing Microsoft.NETCore.App 1.2.0-* results in type ambiguity

area-Infrastructure-libraries

Add Enumerable.Repeat overload accepting a Func.

api-needs-work area-System.Linq

Where is dotnet-bot commands documentation?

area-Infrastructure-libraries question

Add Enumerable.SkipLast, TakeLast to get the last N elements of a sequence.

api-approved area-System.Linq up-for-grabs

Relax Array.Copy to only require that source is assignment-compatible with destination

area-System.Runtime enhancement up-for-grabs

HttpClient and WebSockets don't provide HTTP error details

area-System.Net enhancement

Socket.ReceiveAsync and other methods don't support sync completion

area-System.Net.Sockets enhancement