sort, sortOld, sort20210117, workingSort, It is great to have them all. Just in case
Problems
Readability
Maintainability
S...
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What if:
The only way is to keep both old and new functions.
Real example: pipe and pipe2 in Linux syscall
That doesn't change the fact that it is a code smell. Sometimes language or runtime restrictions make code smells unavoidable.
Many bad languages introduce unavoidable code smells
We should be aware of them