I was doing some experimentation with C# 8's Nullable References Types and came across this issue:
None of the projects allow changing the "Nullable" option within the project's properties window. Some of the projects have that option enabled and others don't even declare it, which probably assumes "disabled" by default.
I can set it manually via the *.csproj file using the <Nullable>enable</Nullable> option, of course.
I also couldn't find a Directory.Build.props, in case that would impact.
I just wanted to understand why the option is greyed out in Visual Studio's UI when opening the project properties window (tab Build, below the "Platform target" option).
Thanks in advance
