Right now if I have the following project structure were all projects are shared source projects:

   / -- B
A 
   \ -- C

I'm unable to utilize both package B & C in the same application like so:

         / -- B -- \
TestApp             A
         \ -- C -- /

This is due to the sources of A being embedded into both B and C:

B: B.cs, A.cs
C: C.cs, A.cs

Which results in duplicate types for the A.cs in a test app. Talked with @loudej and @ChengTian about potential fixes for this issue and @loudej suggested we make shared sources transitive where the nupkg for B would contain a dependency on shared source A. This way package resolution can only bring in one copy of A.cs and essentially only ever do 1 copy of all sources from shared sources.

@loudej / @ChengTian feel free to add additional details.