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well, even 99.9999% possible, we should handle the 0.0001% exception ;) Can I understand that, if collision occurs, let the it generate the id again?

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That would be guaranteeing uniqueness. Don't bother guaranteeing uniqueness. The 99.99999% was an understatement. 12^62 is 99.999999999999999999999999999999999999999999999999999999999992% unique. This is higher odds than being killed by a meteorite.

:) thanks

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