NuGet.exe restore with a PackageReference with exclude=build only does not interpret it correctly.

[nkolev92]

Take an example project like:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="nuget.common" Version="5.6.0" ExcludeAssets="build" />
  </ItemGroup>
</Project>

NuGet.exe would restore with Include="all"
MSbuild.exe would restore with excludeassets build.

The problem is that the the flags don't round trip. See relevant code:

https://github.com/NuGet/NuGet.Client/blob/fc9dd52fcdf3c9a299a96de39b641b7c91779b5e/src/NuGet.Core/NuGet.LibraryModel/LibraryIncludeFlagUtils.cs#L26-L69

compile, runtime, contentFiles, native, analyzers, buildtransitive ends up being parsed to all.

[yiqiju]

I work rounded this by inversing "ExcludeAssets" to "IncludeAssets". Basically you list all the types you want to include: compile and etcs.