[m-rev.] for review: version array reimplementation

[Ralph Becket]

Peter Wang, Monday, 27 July 2009:
> On 2009-07-27, Ralph Becket <rafe at csse.unimelb.edu.au> wrote:
> > 
> > If I recall correctly, my implementation should have ensured that the
> > latest version of the array was always represented as a base/1 value,
> > giving the O(1) properties.  Was there a bug in the code?
> 
> Oops, sorry, I misunderstood your code.  Still, something is causing it
> to perform a lot worse than my version.  Let me try and see why that is.

I think your version may be better because it doesn't penalise old
versions quite as much.  That said, if you are trying to make old
versions fast, it may pay to make old versions track usage and make
a new copy if the overheads become large.
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