Broadcasting error for array type Any on Julia 1.8.1

[jgreener64]

I am using Unitful 1.11.0. The following works as expected on Julia 1.8.0:

using Unitful
[1.0u"m", 2.0u"m"] .+ 3.0u"m"
Any[1.0u"m", 2.0u"m"] .+ 3.0u"m"

However on Julia 1.8.1 the last line errors with

ERROR: + not defined for Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}}
Stacktrace:
 [1] error(::String, ::String, ::Type)
   @ Base ./error.jl:44
 [2] no_op_err(name::String, T::Type)
   @ Base ./promotion.jl:462
 [3] +(x::Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}}, y::Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}})
   @ Base ./promotion.jl:463
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:670 [inlined]
 [5] _broadcast_getindex
   @ ./broadcast.jl:643 [inlined]
 [6] getindex
   @ ./broadcast.jl:597 [inlined]
 [7] copy
   @ ./broadcast.jl:899 [inlined]
 [8] materialize(bc::Base.Broadcast.Broadcasted{Base.Broadcast.DefaultArrayStyle{1}, Nothing, typeof(+), Tuple{Vector{Any}, Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}}}})
   @ Base.Broadcast ./broadcast.jl:860
 [9] top-level scope
   @ REPL[3]:1

[sostock]

This looks like a Julia bug. In the case of the Vector{Any}, Julia 1.8.1 uses the method

+(x::T, y::T) where T<:Number in Base at promotion.jl:463

instead of the correct

+(x::AbstractQuantity{S,D,U}, y::AbstractQuantity{T,D,U}) where {S,T,D,U} in Unitful at quantities.jl:125.

Adding a +(x::Quantity{T,D,U}, y::Quantity{T,D,U}) where {T,D,U} method would work around this, but only for Quantitys (not all AbstractQuantitys, for each of which a similar method would have to be added).

[sostock]

This is now fixed on Julia master (#46722). When 1.8.2 is released, I will add a test to make sure it doesn’t regress.

[jgreener64]

Great, thanks for the info.