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sorts: make power_sort generic over comparable items - #15542
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Add Comparable protocol and PEP 695 TypeVar bound so power_sort, _find_run and _merge accept list[T] instead of bare list/Any. Add string and TypeError doctests; register in shared SORTS battery and non-comparable rejection test. Part of TheAlgorithms#15234
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Part of #15234
Describe your change
Make power_sort, _find_run and _merge generic over a Comparable protocol (PEP 695 TypeVar bound) instead of bare list/Any. Add string-sorting and TypeError doctests. Register power_sort in the shared SORTS battery and the non-comparable rejection test.
Validation: pytest tests/test_sorts.py sorts/power_sort.py --doctest-modules = 447 passed. ruff check + format clean.
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