Keep StructArray results when broadcasting over ArrayOfRDWaveforms

[theHenks]

Since ArraysOfArrays v1, VectorOfArrays and ArrayOfSimilarArrays have their own
broadcast style (NestedArrayStyle), so an ArrayOfRDWaveforms with such a signal
column gets StructArrayStyle{NestedArrayStyle{1}}. StructArrays only builds a
StructArray result for a DefaultArrayStyle parent; otherwise it falls back to a plain
broadcast that returns a Vector of structs (column access like
signalstats.(wvfs, a, b).mean fails with a FieldError) and rebuilds elements with
convert to the declared element type, bypassing the getindex specialization for
StructArray{<:RDWaveform} (fails with a MethodError for lazily read waveforms).

using RadiationDetectorSignals, RadiationDetectorDSP, ArraysOfArrays, FillArrays, Unitful
wvfs = ArrayOfRDWaveforms((Fill((0:0.1:12.7)u"ns", 5), VectorOfSimilarVectors(rand(128, 5))))
bl_stats = signalstats.(wvfs, 0u"ns", 5u"ns")
typeof(bl_stats)   # Vector{@NamedTuple{...}}, was a StructArray with ArraysOfArrays < 1
bl_stats.sigma     # FieldError

This currently breaks the LegendDSP test suite (legend-exp/LegendDSP.jl).

• StructArray{<:RDWaveform} gets broadcast style StructArrayStyle{DefaultArrayStyle{N},N}:
  StructArrays' native path regardless of the signal column type
• array-valued broadcasts ((wf -> 2 .* wf.signal).(wvfs)): plain vector of vectors as with
  ArraysOfArrays < 1, no longer VectorOfArrays
• general StructArrayStyle × NestedArrayStyle fix belongs in ArraysOfArrays; this
  method stays correct either way
• StructArrays lower bound raised to 0.6.6: StructArrayStyle{S,N} exists since 0.6.5, and 0.6.6 fixes
  array-valued broadcasts over StructArrays on Julia 1.10 (Downgrade CI)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.15%. Comparing base (46beaac) to head (3b7e72c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   12.38%   13.15%   +0.76%     
==========================================
  Files           4        4              
  Lines         113      114       +1     
==========================================
+ Hits           14       15       +1     
  Misses         99       99              

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[fhagemann]

I had a similar issue with Unitful for the Downgrade tests in SolidStateDetectors.jl.
You might want to restrict the Unitful version in the Downgrade.yaml workflow file instead of the Project.toml.

See: JuliaPhysics/SolidStateDetectors.jl#637

[theHenks]

I had a similar issue with Unitful for the Downgrade tests in SolidStateDetectors.jl. You might want to restrict the Unitful version in the Downgrade.yaml workflow file instead of the Project.toml.

See: JuliaPhysics/SolidStateDetectors.jl#637

Thanks 🙏🏻 I knew there was some fix for this....