Try to relax method signature

Author: devmotion

src/broadcast.jl

@@ -60,7 +60,7 @@ end
 #     - Q: How do decide on the cuts
 #   - then localise arguments on each node
 ##
-@inline function Base.copyto!(dest::DDestArray, bc::Broadcasted{Nothing})
+@inline function Base.copyto!(dest::DDestArray, bc::Broadcasted)
     axes(dest) == axes(bc) || Broadcast.throwdm(axes(dest), axes(bc))
 
     # Distribute Broadcasted