cumsum on Laurent space Fun does not work

[fgerick]

julia> f = Fun(Laurent(), [1,2,3,4])
Fun(Laurent(【0.0,6.283185307179586❫), [1, 2, 3, 4])

julia> cumsum(f)
ERROR: AssertionError: ncoefficients(f) == 0 || abs(f.coefficients[1]) < 100 * eps()
Stacktrace:
 [1] integrate(f::Fun{Taylor{PeriodicSegment{…}, ComplexF64}, Int64, SubArray{Int64, 1, Vector{…}, Tuple{…}, true}})
   @ ApproxFunFourier ~/.julia/packages/ApproxFunFourier/AYt6V/src/calculus.jl:56
 [2] cumsum(f::Fun{Taylor{PeriodicSegment{…}, ComplexF64}, Int64, SubArray{Int64, 1, Vector{…}, Tuple{…}, true}})
   @ ApproxFunBase ~/.julia/packages/ApproxFunBase/jd32s/src/Fun.jl:714
 [3] iterate
   @ ./generator.jl:47 [inlined]
 [4] _collect(c::Vector{…}, itr::Base.Generator{…}, ::Base.EltypeUnknown, isz::Base.HasShape{…})
   @ Base ./array.jl:854
 [5] collect_similar
   @ ./array.jl:763 [inlined]
 [6] map
   @ ./abstractarray.jl:3286 [inlined]
 [7] cumsum(f::Fun{ApproxFunBase.SumSpace{Tuple{…}, PeriodicSegment{…}, ComplexF64}, Int64, Vector{Int64}})
   @ ApproxFunBase ~/.julia/packages/ApproxFunBase/jd32s/src/Spaces/SumSpace.jl:312
 [8] top-level scope
   @ REPL[3]:1
Some type information was truncated. Use `show(err)` to see complete types.

julia> versioninfo()
Julia Version 1.10.10
Commit 95f30e51f41 (2025-06-27 09:51 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: macOS (x86_64-apple-darwin24.0.0)
  CPU: 16 × Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-15.0.7 (ORCJIT, skylake)
Threads: 16 default, 0 interactive, 8 GC (on 16 virtual cores)
Environment:
  JULIA_NUM_THREADS = 16

(jl_Yu4Eks) pkg> st
Status `/private/var/folders/kj/g4l55jh967zgr_gdj12tbjdm0000gn/T/jl_Yu4Eks/Project.toml`
  [28f2ccd6] ApproxFun v0.13.28

Not sure why this assertion error is triggered, since

julia> ncoefficients(f)
4

julia> abs(f.coefficients[1])
1