Unable to broadcast assign to IMAS expression

[bclyons12]

I attempted to do something like cp1d.conductivity_parallel .= 1.0 ./ eta. It runs as if it works, but then cp1d.conductivity_parallel is unchanged in the dd. Running it with = works fine.

[bclyons12]

Maybe this will help determine the correct failure mode. If I try to do something like that for a range, I get:

ERROR: CanonicalIndexError: setindex! not defined for StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}
Stacktrace:
 [1] error_if_canonical_setindex(#unused#::IndexLinear, A::StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, #unused#::Int64)
   @ Base ./abstractarray.jl:1407
 [2] setindex!
   @ ./abstractarray.jl:1398 [inlined]
 [3] fill!
   @ ./multidimensional.jl:1086 [inlined]
 [4] copyto!
   @ ./broadcast.jl:934 [inlined]
 [5] materialize!
   @ ./broadcast.jl:884 [inlined]
 [6] materialize!(dest::StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}, bc::Base.Broadcast.Broadcasted{Base.Broadcast.DefaultArrayStyle{0}, Nothing, typeof(identity), Tuple{Float64}})
   @ Base.Broadcast ./broadcast.jl:881
 [7] top-level scope
   @ REPL[42]:1