coerce_to_sparse_matrix() doens't handle default values

[EmilHvitfeldt]

look at last 4 columns

sparsevctrs::coerce_to_sparse_matrix(mtcars) |> head()
#> 6 x 11 sparse Matrix of class "dgCMatrix"
#>   [[ suppressing 11 column names 'mpg', 'cyl', 'disp' ... ]]
#>                                                          
#> Mazda RX4         21.0 6 160 110 3.90 2.620 16.46 0 1 4 4
#> Mazda RX4 Wag     21.0 6 160 110 3.90 2.875 17.02 0 1 4 4
#> Datsun 710        22.8 4 108  93 3.85 2.320 18.61 1 1 4 1
#> Hornet 4 Drive    21.4 6 258 110 3.08 3.215 19.44 1 0 3 1
#> Hornet Sportabout 18.7 8 360 175 3.15 3.440 17.02 0 0 3 2
#> Valiant           18.1 6 225 105 2.76 3.460 20.22 1 0 3 1
Matrix::Matrix(as.matrix(mtcars), sparse = TRUE) |> head()
#> 6 x 11 sparse Matrix of class "dgCMatrix"
#>   [[ suppressing 11 column names 'mpg', 'cyl', 'disp' ... ]]
#>                                                          
#> Mazda RX4         21.0 6 160 110 3.90 2.620 16.46 . 1 4 4
#> Mazda RX4 Wag     21.0 6 160 110 3.90 2.875 17.02 . 1 4 4
#> Datsun 710        22.8 4 108  93 3.85 2.320 18.61 1 1 4 1
#> Hornet 4 Drive    21.4 6 258 110 3.08 3.215 19.44 1 . 3 1
#> Hornet Sportabout 18.7 8 360 175 3.15 3.440 17.02 . . 3 2
#> Valiant           18.1 6 225 105 2.76 3.460 20.22 1 . 3 1

^{Created on 2024-05-21 with reprex v2.1.0}

[EmilHvitfeldt]

ideally, these two calls should produce same results

[EmilHvitfeldt]

fixed in #77