Since no-one has mentioned it so far, I just want to add that reduce and other folding operations unroll the implicit loop over a tuple:
julia> @code_typed reduce(+, args)
CodeInfo(
1 ─ %1 = Core.getfield(itr, 1)::UInt8
│ %2 = Core.getfield(itr, 2)::Int16
│ %3 = Core.getfield(itr, 3)::UInt32
│ %4 = Core.getfield(itr, 4)::Float32
│ %5 = Core.getfield(itr, 5)::Float64
│ %6 = Core.zext_int(Core.Int16, %1)::Int16
│ %7 = Base.add_int(%6, %2)::Int16
│ %8 = Base.sext_int(UInt32, %7)::UInt32
│ %9 = Base.add_int(%8, %3)::UInt32
│ %10 = Base.uitofp(Float32, %9)::Float32
│ %11 = Base.add_float(%10, %4)::Float32
│ %12 = Base.fpext(Base.Float64, %11)::Float64
│ %13 = Base.add_float(%12, %5)::Float64
└── return %13
) => Float64