Problem: Reflection is a debugging tool and not really meant for use on production. There are easier ways to check if a class implements an interface with `is_a()`.
Solution: Get rid of reflection use and switch to `is_a()` in TaskManager, refactor the Enum thing that does not make sense since it is not being used.
The `is_a()` solution is really straightforward and has been supported in php for ages.
The Enum thing was a copy paste hack from stackoverflow and ignored the simple solution mentioned there while not using the features of the advanced one.
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