Fiber(SparseHash{1}((5,), Dict{Tuple{Int64, Tuple{Int64}}, Int64}(…), [(1, (1,)) => 1, (1, (2,)) => 2, (1, (3,)) => 3, …], [1, 6, 0, …], Dense(10, Element{0.0}([2.0, 0.0, 1.0, …]))), Env(name=dst))
