julia> B = GBVector([1, 2, 3, 4, 5, 6, 7], [1, 2, 3, 4, 5, 6, 7])
7x1 GraphBLAS int64_t matrix, full by col
  7 entries, memory: 264 bytes

    (1,1)   1
    (2,1)   2
    (3,1)   3
    (4,1)   4
    (5,1)   5
    (6,1)   6
    (7,1)   7


julia> B = GBVector{Int}([1, 2, 3, 4, 5, 6, 7], [1, 2, 3, 4, 5, 6, 7])
ERROR: MethodError: no method matching (GBVector{Int64})(::Vector{Int64}, ::Vector{Int64})
Closest candidates are:
  (GBVector{T})(::Any; fill) where T at ~/.julia/packages/SuiteSparseGraphBLAS/5AOj3/src/vector.jl:6
Stacktrace:
 [1] top-level scope
   @ REPL[28]:1