In regard to 0.7.0-beta2, the transpose of a `SparseMatrixCSC`

is no longer a `SparseMatrixCSC`

; instead it is some other object. How do I convert it to `SparseMatrixCSC`

? Below are a couple of obvious things I tried. Both work fine for small matrices, but both take a really long time on big matrices, so I guess there must be a better way? I suppose I could manually pick apart the is,js,es, but that wasn’t necessary in 0.6.

```
julia> import SparseArrays.sparse
julia> import SparseArrays.spzeros
julia> x = spzeros(10000,10000)
10000×10000 SparseArrays.SparseMatrixCSC{Float64,Int64} with 0 stored entries
julia> y = sparse(x')
10000×10000 SparseArrays.SparseMatrixCSC{Float64,Int64} with 0 stored entries
julia> x = spzeros(100000,100000)
100000×100000 SparseArrays.SparseMatrixCSC{Float64,Int64} with 0 stored entries
julia> y = sparse(x')
100000×100000 SparseArrays.SparseMatrixCSC{Float64,Int64} with 0 stored entries
julia> import SparseArrays.SparseMatrixCSC
julia> x = spzeros(100000,100000)
100000×100000 SparseMatrixCSC{Float64,Int64} with 0 stored entries
julia> y = convert(SparseMatrixCSC{Float64,Int}, x')
100000×100000 SparseMatrixCSC{Float64,Int64} with 0 stored entries
```