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2bc8c92279
same target more than once; it implicitly dedupes only in the case of a relationship join, and due to 🎫`3233`, in 1.0 a join to the same table twice behaves differently than 0.9 in that it no longer erroneously aliases. To help document this change, the verbiage regarding 🎫`3233` in the migration notes has been generalized, and a warning has been added when :meth:`.Query.join` is called against the same target relationship more than once. fixes #3367