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when running a task, ploomber stores the source code and parameters. if you try running the task again but the code and parameters have not changed, it will skip it. we store the code and parameters in a metadata file that has JSON format. this means that there's only certain data types that we can store (only the ones that we can store in a JSON file). this warning is telling you that changes to the "dag" parameter wont be detected. so if you run the task, and change the parameter, ploomber still thinks the task is up-to-date. here's how to supress it: https://stackoverflow.com/a/56142903/709975 looks like you're passing a task as parameter to another task, what's the use case?