getindex(::Tensor, i::Int) throws AssertionError

[jpsamaroo]

On Finch 1.2.9, the following occurs:

julia> using Finch

julia> A = fsprand(4, 4, 0.5);

julia> A[1]
ERROR: AssertionError: ndims(arr) == length(inds)
Stacktrace:
 [1] macro expansion
   @ ~/.julia/packages/Finch/tUiDI/src/interface/index.jl:78 [inlined]
 [2] var"##getindex_helper_generator#265"(arr::Type, inds::Type)
   @ Finch ~/.julia/packages/Finch/tUiDI/src/util/staging.jl:32
 [3] (::Finch.var"#1822#1828"{DataType, DataType})()
   @ Finch ~/.julia/packages/Finch/tUiDI/src/util/staging.jl:65
 [4] #s364#1821
   @ ~/.julia/packages/Finch/tUiDI/src/util/staging.jl:74 [inlined]
 [5] var"#s364#1821"(::Any, arr::Any, inds::Any)
   @ Finch ./none:0
 [6] (::Core.GeneratedFunctionStub)(::UInt64, ::LineNumberNode, ::Any, ::Vararg{Any})
   @ Core ./boot.jl:707
 [7] getindex(arr::Tensor{SparseCOOLevel{2, Tuple{Int64, Int64}, Vector{Int64}, Tuple{Vector{…}, Vector{…}}, ElementLevel{0.0, Float64, Int64, Vector{…}}}}, inds::Int64)
   @ Finch ~/.julia/packages/Finch/tUiDI/src/interface/index.jl:52
 [8] top-level scope
   @ REPL[4]:1
Some type information was truncated. Use `show(err)` to see complete types.

While linear indexing may not be an efficient way to access a Tensor, it's convenient to have for generic code (even though Tensor is not an AbstractArray).