The from i32 column major order method can create inconsistent internal state. When labels length and n items mismatch, n clusterings becomes labels.len() / n items (truncated), but subsequent calls to label() use indices that exceed the internal data bounds, causing a buffer overflow.

For example, Clusterings::from i32 column major order(&[1,2,3,4,5], 3) creates clusterings with n clusterings = 5/3 = 1. Then clusterings.label(1, 0) accesses index 1*3 = 3, but only 3 elements exist (indices 0,1,2), causing out-of-bounds access.

This can be triggered through safe public APIs — from i32 column major order() and label() — with no unsafe required from the caller.