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On 07/04/2013 08:51 AM, Philipp Janda wrote:

Both approaches need an incompatible way of deleting values. In fact *any* approach which allows storing nils needs a new syntax for removing values (or new syntax for storing nil, `t[n] = nil` cannot be used for both).

Isn't this the essence of the whole discussion? It doesn't matter wich solution for storing nils you prefer you will never find a way around this.