Unary broadcasting `identity.(a)` and `ComplexF64.(a)` don't preserve `Ones` and `Zeros`

For example:

julia> identity.(Zeros(2))
2-element Fill{Float64}, with entries equal to 0.0

julia> identity.(Ones(2))
2-element Fill{Float64}, with entries equal to 1.0

julia> ComplexF64.(Zeros(2))
2-element Fill{ComplexF64}, with entries equal to 0.0 + 0.0im

julia> ComplexF64.(Ones(2))
2-element Fill{ComplexF64}, with entries equal to 1.0 + 0.0im

julia> complex.(Zeros(2))
2-element Fill{ComplexF64}, with entries equal to 0.0 + 0.0im

julia> complex.(Ones(2))
2-element Fill{ComplexF64}, with entries equal to 1.0 + 0.0im

julia> pkgversion(FillArrays)
v"1.13.0"

julia> versioninfo()
Julia Version 1.11.6
Commit 9615af0f269 (2025-07-09 12:58 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 10 × Apple M1 Max
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, apple-m1)
Threads: 1 default, 0 interactive, 1 GC (on 8 virtual cores)
Environment:
  JULIA_EDITOR = code

Run the Julia REPL examples from the issue with FillArrays v1.13.0 and confirm the displayed results for identity., ComplexF64.(), and complex.(). Then trace the unary broadcasting implementation used by Ones and Zeros; done means these calls preserve the appropriate filled-array representation and values.