make assignment work on ustrip'ed AbstractArrays

Author: bjarthur

src/utils.jl

@@ -75,7 +75,7 @@ julia> a[1] = 3u"m"; b
  2
 ```
 """
-@inline ustrip(A::Array{Q}) where {Q <: Quantity} = reinterpret(numtype(Q), A)
+@inline ustrip(A::AbstractArray{Q}) where {Q <: Quantity} = reinterpret(numtype(Q), A)
 
 @deprecate(ustrip(A::AbstractArray{T}) where {T<:Number}, ustrip.(A))
 

test/runtests.jl

@@ -1425,6 +1425,9 @@ end
                 Tridiagonal{Int}
             @test typeof(ustrip(SymTridiagonal([1,2,3]u"m", [4,5]u"m"))) <:
                 SymTridiagonal{Int}
+            S = Symmetric(zeros(3,3))*1u"s"
+            ustrip(S)[1]=1
+            @test S[1] == 1u"s"
         end
         @testset ">> Linear algebra" begin
             @test istril(1m) === true