Cast callbacks to functions when set with default_args on task groups #174
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Hello!
When used in the task group's default_args, callbacks are passed as strings to the tasks, which ends up generating failures.
The idea is to perform the same parse used in
make_task
(it is necessary to check whether the default_args attribute is defined, since it is optional and defaults to None) and perhaps in the future modularize this conversion functionality in order to cover the widespread use of default_args.