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9234883914
Scalar doesn't necessarily support implicit construction from int or
assignment from int.
Here's the error message I got without this fix:
```
/home/tav/git/Sleipnir/build/_deps/eigen3-src/Eigen/src/SparseCore/SparseVector.h:180:25: error: no match for ‘operator=’ (operand types are ‘Eigen::internal::CompressedStorage<ExplicitDouble, int>::Scalar’ {aka ‘ExplicitDouble’} and ‘int’)
180 | m_data.value(p + 1) = 0;
| ~~~~~~~~~~~~~~~~~~~~^~~
```
See merge request libeigen/eigen!2046
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