Add specification regarding batches to TZIP-12/FA2
What to do in the case of duplicate entries in a batch is underspecified.
Consider getting token metadata. Reasonable behaviors include:
- Failing on duplicates, especially in the case of a single token
- Return metadata for all duplicates
- Silently deduplicate
While it's unlikely that a user interacting with
tezos-client or a wallet will submit duplicates, contracts that use the metadata are more likely to. For example, consider a contract that performs assertions on the metadata for each