bug with HNF removing rows
I expect
`np.flip (hermite_normal_form (Matrix (np.flip (np.array ([[5, 8, 12], [0, 0, 1]]))).T).T))`
to give
`[[5, 8, 0], [0, 0, 1]]`
but instead I get
`[[5, 8, 0]]`
It seems to be falsely identifying my matrix as rank-deficient and removing the row when I try to achieve a row-style HNF using flips and transposes.
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