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The code used the Python 2 cmp() function, which doesn't exist in Python 3.
Fix: Replaced with functools.cmp_to_key() or key functions for sort().
'<' not supported between instances of 'str' and 'float'.
Problem: The byDateFunc() function sometimes returned a float (timestamp) and sometimes a string (fallback to name).
Fix: Used a tuple (priority, value) to ensure consistent sorting:
(0, timestamp) for elements with a valid date.
(1, name) for elements without a date.