.Net Framework 3.5 and ValueTuple

[davidhunter22]

In the Readme is states
"Note: use on .NET Framework 3.5 is particularly limited due to shortcomings of the BCL there. In particular, the System.Range type will not be generated unless System.ValueTuple is referenced"
I tried referencing System.ValueTuple but it doesn't seem to support .NET 3.5 accoring to https://www.nuget.org/packages/System.ValueTuple.
Before I was using the ValueTupleBridge nuget package, should I still use this.
In general is there some reason why PolySharp can't generate the System.ValueTuple types for 3.5?

Sad that I still have to support some .Net 3.5 stuff.