Is this a known bug? sage: R.<K, k> = ZZ[] sage: ((9*k*K^7 - 3*k*K^5 + 9*K)/(2*(2*K+1))).factor() Traceback (most recent call last): ... TypeError: Cannot multiply 3 * K * (3*K^6*k - K^4*k + 3) and 2^-1 * (2*K + 1)^-1 because they cannot be coerced into a common universe
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