Gas Optimizations

[code423n4]

Declare variables immutable

The _name, _symbol, and _minter state variables in VoterID are set in the constructor and do not change. They can be declared immutable.

VoterID.sol#L65-L66

    string _name;
    string _symbol;

VoterID.sol#L73-L74

 // minter has the sole, permanent authority to mint identities, in practice this will be a contract
    address public _minter;

Suggestion:

    string immutable _name;
    string immutable _symbol;

 // minter has the sole, permanent authority to mint identities, in practice this will be a contract
    address immutable public _minter;

[illuzen]

all duplicates