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How should the Tezos network support tokens?
As is: Leave Tezos protocol unchanged
This solution is possible today with Michelson's bigmap capability. Any other solution is unnecessary complication.
Leaving the current solution can cause the pollution of the Tezos blockchain with data about tokens which are potentially unrelated to Tezos.
Incentivises the creation of contracts which store a lot of data on the blockchain, potentially causing disk scalability problems in the future.