Noticed from DllExport project:
$(pMeta = "Metadata")
...
Metadata .NET: $(TargetFrameworkVersion:$(pMeta))
may return Metadata .NET: v4.0 (1.6.0-beta2) and Metadata .NET: v2.0 (1.6.0-beta3)
When <TargetFrameworkVersion>v2.0</TargetFrameworkVersion> https://github.com/3F/DllExport/blob/20eb9db848f4ae4f730a311c1e22567b83ded629/Metadata/Metadata.csproj#L9