Unique chain IDs

I do not think it is necessarily a design problem with EIP155 as the author of this issue states. But I agree that we should try to prevent duplicate chainIDs:

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Similar proposals are arising time to time.
Thank you for bringing it up!
Initially it was @Arachnid who proposed it.

I will link similar proposals to this topic later.

We need chain id for messaging routing between forks and subnets.