Since we're nightly and using coerce_unsized, we can just coerce a Gc<T: Obj> into a Gc<dyn Obj> for free. Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
object.rs was getting a little big and the implementations are only going to get bigger. Signed-off-by: Alek Ratzloff <alekratz@gmail.com>