Bug with initializing extra rows in sparse arrays

General Usage
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1

I found what I believe to be a bug in SparseArrays. If I try to make a sparse array with more rows than the max row number It fails with the error:

11×10 SparseMatrixCSC{Any, Int64} with 100 stored entries:
ERROR: MethodError: no method matching zero(::Type{Any})

Note that it actually creates the array A and I can do math with it, but for some reason it cannot display A. A minimum example of faliure is the following:

using SparseArrays

N = 10
M = 1

rows = []
cols = []
vals = []
for i = 1:N
    for j = 1:N
    push!(rows, i)
    push!(cols, j)
    push!(vals, 1)
    end
end

A = sparse(rows, cols, vals, N+M, N)

to make is stranger, if you set M to be 1,2,3,4, or 5 it fails, but if you set M>5 it works.

2

I discovered that the issue is resolved if I specify the type of the vectors that make up A like

rows = Int[]
cols = Int[]
vals = Float64[]

It is still strange to me why I don’t have to do this when M>5.