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I need numeric IDs for human readability. How do I get it in Firebase?

I want numeric ID for keys, e.g. "000000001", "000000002","00000003","00000004".

The reason I need it is because these IDs will become the permanent object ID both online and offline. I want users to be able to browse that object page by just entering URL "/objects/00000001" without efforts.

I am asking here, because I want to know if this can be done without using .priority, sub-properties, etc. I guess set method can do it somehow. If it is not possible, just tell me no, I can accept that answer.

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