I have a F # project that uses FSharp.Core version 4.1.0. When I upgrade to version 4.1.12, NuGet adds the following files to the project source code directory:
any/netstandard1.6/FSharp.Core.sigdataany/netstandard1.6/FSharp.Core.optdata
I expect NuGet to add files to the packages directory, and not directly to my project. The presence of these files next to the .fs files in the project source tree seems strange. Is this expected behavior? Can I safely delete these files (since copies supposedly exist in packages )?
Here is an example of what I see:

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