When building a Sparse*Sparse product which is later decomposed it can be advantageous not to prune numerical zeros, so that the symbolical decomposition can be reused.
Moreover it might be possible to 'recompute' a Sparse*Sparse product where the structure did not change thus no overhead for reallocation would arise.
The first wish is fixed by change f4c8f74154f9.
I'll add a new entry for the second wish.
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