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On 16/06/2011 16.41, HyperHacker wrote:
On Jun 16, 2011 12:29 AM, "Lorenzo Donati" <

 > "A table is called a sequence if there exists a non-negative integer
n such that the set of its numeric keys is {1...n}. In this case n is
defined as the length of the sequence. An empty table {} or a table with
no numeric keys is considered a sequence of length 0."

Does that mean a table having keys 0, -1 or 1.5 no longer has a defined

That's what I understood reading 5.2 manual. Any numeric key which is either non-integer or outside the 1...n integer range disrupts the "sequenciness" (ugly, but clear :-) of the table.

I suppose that was also the behaviour in 5.1, but I didn't test it. I always considered bad practice to put negative or non-integer numeric keys in a table and still considering it an "array" (old terminology).

As for "arrays" with an added 0-key element I'm not sure. I don't remember having had problems treating, for example, lua standalone interpreter's "arg" as an array, which has arg[0] (and even may have arg[-1], arg[-2], ...).