the change in sqlalchemy/sqlalchemy#5618 is now hitting me as I'm trying to write a recipe for someone. when we take columns into the operations we should just run _copy() on them so that we dont get the already attached to table issue.
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A fix for sqlalchemy#753 was merged in November 2020 and released in 1.5.0 in January 2021.
This updates the references to sqlalchemy#753 in cookbook.rst to note that a fix for sqlalchemy#753 has been released.