@fiber(sl(e(0)) constructors:
initialized fiber: Fiber(SparseList{Int64, Int64}(Element{0.0, Float64}([2.0, 2.0, 3.0, 3.0]), 6, [1, 5], [2, 3, 5, 6]))
initialized fiber: Fiber(SparseList{Int16, Int64}(Element{0.0, Float64}([2.0, 2.0, 3.0, 3.0]), 6, [1, 5], [2, 3, 5, 6]))
sized fiber: Fiber(SparseList{Int64, Int64}(Element{0.0, Float64}([]), 7, [1, 1], []))
sized fiber: Fiber(SparseList{Int16, Int64}(Element{0.0, Float64}([]), 7, [1, 1], []))
empty fiber: Fiber(SparseList{Int64, Int64}(Element{0.0, Float64}([]), 0, [1, 1], []))
empty fiber: Fiber(SparseList{Int16, Int64}(Element{0.0, Float64}([]), 0, [1, 1], []))

