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On Mon, Jan 03, 2011 at 02:40:06AM +0200, Quae Quack wrote:
> So... in lack of this magical site for working on common code, I
> submit for consideration a suitable array implementation:

Your code forces all indices to be numbers.  That is not necessary.
It should force all integer keys to lie in a block 1 to #a with
no holes, yes, but string keys are OK. They don't confuse the table 
library functions and  are quite useful.  

E.g. this line from a data file of finite integer sequences:

entry{3,5,17,257,65537, note="all known Fermat primes", OEIS="A000215",
    formula=function (n) return 2^(2^(n-1))+1 end}