dynamic array memory allocation

[davidl]

It's useful. Seperating the concept of capacity and length should be  
considered carefully

> I find myself wondering what actually happens when I create a dynamic  
> array and concatenate items onto it.  I think I read in a post that  
> memory will be over-allocated at times to avoid re-allocating.
>
> I think it would help out a lot to have an ability to specify  
> over-allocation.  Something like
> uint a = [];
> a.length = 3:10
>
> Where the array length is 3, but you are guaranteed to have memory  
> allocation for 10, so you can be guaranteed that concatenation up to ten  
> will not need to allocate memory.  This could help in the situation  
> where there is concatenation in a loop, and the programmer over-sizes  
> the array before the loop and re-sizes after the loop.



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