[Oberon] Dynamic local array implementation

[Luca Boasso]

>
> Note that this can cause aliasing problems, expecially in
> multithreading programs. One has to copy the content of
> the structure parameter in a local variable to make sure
> that it remains constant (and consistent) during the whole
> processing.
>
> There are also cases where the content is processed so many
> times that the cost of dereferencing is higher than the cost of
> the (initial) copying.
>

Very good points!
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