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Question #3 Difficulty: 1

According to the Solidity 0.8.17 compiler (200 optimization runs) 

    // Which function uses more gas, f256 or f64?

contract C {
  function f256(uint u256) external pure returns (uint) {
    return u256;
  }

  function f64(uint64 u64) external pure returns (uint) {
      return u64;
  }
}

Hint:

Function arguments are not packed so each one will take at least 256 bits, but does passing in something conceptually smaller cost more?

Answer:

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