Tangent being Constructed with wrong type in forward mode

[oxinabox]

Found this when trying to reproduce something else.
I though we had fixed these but I guess not

julia> using Diffractor

julia> var"'" = Diffractor.PrimeDerivativeFwd
Diffractor.PrimeDerivativeFwd

julia> struct Foo
       x::Float64
       end

julia> f(x) = Foo(x)
f (generic function with 1 method)

julia> f(23)
Foo(23.0)

julia> f'(23)
ERROR: ArgumentError: Tangent for the primal Foo should be backed by a NamedTuple type, not by Tuple{Int64}.
Stacktrace:
 [1] _backing_error(P::Type, G::Type, E::Type)
   @ ChainRulesCore ~/.julia/packages/ChainRulesCore/0t04l/src/tangent_types/tangent.jl:62
 [2] ChainRulesCore.Tangent{Foo, Tuple{Int64}}(backing::Tuple{Int64})
   @ ChainRulesCore ~/.julia/packages/ChainRulesCore/0t04l/src/tangent_types/tangent.jl:36
 [3] (ChainRulesCore.Tangent{Foo})(args::Int64)
   @ ChainRulesCore ~/.julia/packages/ChainRulesCore/0t04l/src/tangent_types/tangent.jl:48
 [4] getindex(tb::Diffractor.CompositeBundle{1, Foo, Tuple{Diffractor.TangentBundle{1, Float64, Diffractor.TaylorTangent{Tuple{Int64}}}}}, tti::Diffractor.TaylorTangentIndex)
   @ Diffractor ~/JuliaEnvs/Diffractor.jl/src/tangent.jl:299
 [5] (::Diffractor.PrimeDerivativeFwd{1, typeof(f)})(x::Int64)
   @ Diffractor ~/JuliaEnvs/Diffractor.jl/src/interface.jl:180
 [6] top-level scope
   @ REPL[9]:1