@Override
  public boolean equals(final Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    final JsonRpcRequestId that = (JsonRpcRequestId) o;
    return Objects.equals(id, that.id);
  }
The JSON spec says "The use of Null as a value for the id member in a Request object is
discouraged" Both geth and parity accept null values, so we decided to support them as well.
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/JsonRpcRequestId.java