export function isRpcQuantityString(u: unknown): u is string {
  return (
    typeof u === "string" && /^0x(?:0|(?:[1-9a-fA-F][0-9a-fA-F]*))$/.test(u)
  );
}

export function isRpcDataString(u: unknown): u is string {
  return typeof u === "string" && /^0x(?:[0-9a-fA-F]{2})*$/.test(u);
}