@Override
  public int hashCode() {
    return slotHash.hashCode();
  }
Indicates whether some other object is "equal to" this one. Two StorageSlotKey objects are
considered equal if their slot hash values are equal.

@param o the reference object with which to compare.
@return true if this object is the same as the obj argument; false otherwise.
datatypes/src/main/java/org/hyperledger/besu/datatypes/StorageSlotKey.java