Wrong tensor product between Fourier and Chebyshev about approxfun.jl

[mzaffalon]

The problem is with the tensor product with two Fourier spaces:

using ApproxFun
f = Fun(Fourier(), [0; 0; 1]);
kron(f,f).coefficients

This if-statement breaks too early. According to the documentation,, the ordering in the function is assumed to be (1,1), (1,2), (2,1), (1,3), (2,2)... but for Fourier spaces it appears that the ordering is instead (1,1), (1,2), (2,1), (2,2), (1,3).

What does TODO: generalize refer too?