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I don't necessarily agree here. An email address is itself a globally addressable primary key. In a lot of real world systems, the benefits of abstracting that

I don't necessarily agree here. An email address is itself a globally addressable primary key. In a lot of real world systems, the benefits of abstracting that are lower than the costs.

mooreds 7y ago
But it isn't immutable in the long run. That is, the same entity may have more than one email address over time.
peheje 7y ago
You are not looking around the corner.