Support for fft of DualComplex Numbers

using DualNumbers;
x=[DualComplex256(1,1) for i in 1:10]  
fft(x)

I get the following error:

ERROR: MethodError: no method matching plan_fft(::Array{DualNumbers.Dual{Complex
{Float64}},1}, ::UnitRange{Int64})
Closest candidates are:
  plan_fft(::Union{Base.ReshapedArray{T<:Union{Complex{Float32}, Complex{Float64
}},N,A,MI} where MI<:Tuple{Vararg{Base.MultiplicativeInverses.SignedMultiplicati
veInverse{Int64},N} where N} where A<:Union{DenseArray, SubArray{T,N,P,I,true} w
here I<:Tuple{Union{Base.Slice, UnitRange},Vararg{Any,N} where N} where P where
N where T}, DenseArray{T<:Union{Complex{Float32}, Complex{Float64}},N}, SubArray
{T<:Union{Complex{Float32}, Complex{Float64}},N,A,I,L} where L} where I<:Tuple{V
ararg{Union{Base.AbstractCartesianIndex, Int64, Range{Int64}},N} where N} where
A<:Union{Base.ReshapedArray{T,N,A,MI} where MI<:Tuple{Vararg{Base.Multiplicative
Inverses.SignedMultiplicativeInverse{Int64},N} where N} where A<:Union{DenseArra
y, SubArray{T,N,P,I,true} where I<:Tuple{Union{Base.Slice, UnitRange},Vararg{Any
,N} where N} where P where N where T} where N where T, DenseArray}, ::Any; flags
, timelimit) where {T<:Union{Complex{Float32}, Complex{Float64}}, N} at fft\FFTW
.jl:596
  plan_fft(::AbstractArray{#s262,N} where N where #s262<:Real, ::Any; kws...) at
 dft.jl:205
  plan_fft(::AbstractArray{#s250,N} where N where #s250<:(Complex{#s249} where #
s249<:Union{Integer, Rational}), ::Any; kws...) at dft.jl:207
  ...
Stacktrace:
 [1] #plan_fft#1(::Array{Any,1}, ::Function, ::Array{DualNumbers.Dual{Complex{Fl
oat64}},1}) at .\dft.jl:58
 [2] fft(::Array{DualNumbers.Dual{Complex{Float64}},1}) at .\dft.jl:56

Start by reproducing the Julia example with DualComplex256 and inspect the fft and plan_fft entry points shown in dft.jl and FFTW.jl. Done means fft(x) works for the demonstrated DualComplex array without the reported MethodError.