https://github.com/numpy/numpy/blob/92ebe1e9a6aeb47a881a1226b08218175776f9ea/numpy/lib/polynomial.py#L959 The typo in this line causes wrong return types in cases when `v` is `poly1d` fix to be: `truepoly = (isinstance(u, poly1d) or isinstance(v, poly1d))`
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