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51e2651b29
com_factor(): when a unary minus is attached to a float or imaginary zero, don't optimize the UNARY_MINUS opcode away: the const dict can't distinguish between +0.0 and -0.0, so ended up treating both like the first one added to it. Optimizing UNARY_PLUS away isn't a problem. (BTW, I already uploaded the 2.2a3 Windows installer, and this isn't important enough to delay the release.)