b in QQ is (or should be) equivalent to QQ(b) not throwing an error. But if that fails, it only means that Sage can't convert it to a rational directly, it is perfectly possible that after a series of (computationally expensive) steps one could transform b into a rational. But if we would always try every possible simplification then Sage would run very slow. Also, if "in" were mathematical equivalence, what should Sage return for zeta(5) in QQ?
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