what does exactly VietorisRipsPersistence(metric="precomputed") do when X has non-zero diagonal

[elagoda]

The documentation says that, when one uses VietorisRipsPersistence(metric="precomputed"), matrices in X should have the following property:
Entries of X should be compatible with a filtration, i.e. the value at index (i, j) should be no smaller than the values at diagonal indices (i, i) and (j, j).

At the same time, if I feed it matrices that don't have this property, the code does not throw an exception. How does the code handle this situation?