>> When memory comes into play you might need destructive
>> updates to arrays, etc.
>
> Which is only a problem if your compiler isn't smart enough, or disallows 
> providing the appropriate hints. :-)

The point is that there is no way for a compiler to decide.
Sometimes one is better, and sometimes another. It's up
to the programmer to pick what is correct. If a programmer
picks incorrect, it usually ends up being more complex
instead of simpler.

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