Upgrade DST20 contract to allow 1:1 splits

[Bushstar]

Summary

Resolves the issue where a 1:1 split fails due to the following DST20V2 contract code. 1:1 splits are used in the dToken restart, without this upgrade it is not possible to use the upgradeToken function in the contract once all locked tokens have been released.

if (newAmount != amount) {
        _burn(msg.sender, amount);
        IERC20(newTokenContractAddress).transfer(msg.sender, newAmount);
}

Adds a DST20V3 contract that checks the contract address rather than the amount.

if (newTokenContractAddress != address(this)) {
    _burn(msg.sender, amount);
     IERC20(newTokenContractAddress).transfer(msg.sender, newAmount);
}

Implications

• Storage

  • Database reindex required
  • Database reindex optional
  • Database reindex not required
  • None

• Consensus

  • Network upgrade required
  • Includes backward compatible changes
  • Includes consensus workarounds
  • Includes consensus refactors
  • None