The `DLT` contract is a token management system that supports multiple token types identified by `mainId` and `subId`. It allows for minting, burning, transferring, and batch transferring of tokens. The contract includes approval mechanisms for token spending and ensures safe transfers to smart contracts by checking for the `IDLTReceiver` interface. It also supports balance and allowance queries for specific token types.

The `DLTUpgradeable` contract is an upgradeable token contract that supports multiple token types identified by `mainId` and `subId`. It allows for minting, burning, transferring, and batch transferring of tokens. It includes approval mechanisms for token allowances and operator approvals. The contract ensures safe transfers by checking if the recipient is a compliant contract implementing `IDLTReceiverUpgradeable`.

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/// ERC3643 🦖                                            /// ERC6960 🏢
         
/// Solidity / Typescript / Node / Web