Sum of two Symmetric matrices is not of the same type

[CodeLenz]

Hi

I don't know if it is the intended behaviour (master 0.7.0-DEV.2597 Commit 6827170)

Lets create a symmetric sparse matrix B

A = sprand(5,5,0.8); A = A+A'; B=Symmetric(A);
and copy it to another symmetric C

C = copy(B);
typeof(C)==typeof(B)
true

The sum of B and C should be (or it should not?) of the same type, but

typeof(B+C) 
Array{Float64,2}

[fredrikekre]

JuliaLang/LinearAlgebra.jl#439