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Reference issue
Reproduced on
masterat 61a8b0b.What does this implement/fix?
The least-squares matrix combines independent sums of x and y with terms computed by zip. Unequal input lengths can silently produce a circle from inconsistent observations. Enforce the documented ValueError before building the system.
Additional information
Both directions of the length mismatch are exercised with otherwise noncollinear points. The regression failed on the original implementation and passed after the fix. Tested with Python 3.13.17 and the repository's pinned requirements. The modified module's tests and examples passed, Ruff passed, and the Sphinx HTML build succeeded.
CheckList