conflict with system.commandline

In F#, I see regular issues where the compiler is trying to use System.CommandLine.

When you do 'open CommandLine', you get this warning:

`This declaration opens the namespace or module 'System.CommandLine' through a partially qualified path. Adjust this code to use the full path of the namespace. This change will make your code more robust as new constructs are added to the F# and CLI libraries.`

This means that you cannot open the System lib in the same file and this is annoying because it is pretty much the most commonly included lib in the whole dotnet ecosystem.