I decided to remove the local AssemblyInfo and replace it with a link to main FakeItEasy AssemblyInfo so that code suppressions are re-used. I've used this approach in the past when multi-targeting and it works just fine.

It's perhaps worth noting that the assembly COM visible GUID will now be different, but I think the case of someone using the Silverlight binary from COM (if this is even possible) is about as corner-case as you can get ;-).