MinecraftForge/FML@d8b6adb2598ce144568a0aaf26fa8b988c028b7c Add a helper for casting some common collection types into generic form
MinecraftForge/FML@5275cea844a6afacc0deb41d153f01c1c25bb924 Try and see if there is anything to the identityHashCode collision hypothesis. If you see this in your error messages, kindly let us know!