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/** * Checks if `a` and `b` are structurally equal using the following algorithm: * * - primitives are compared by value * - functions are compared by reference * - objects (including arrays) are checked to have the same properties and *   their values are compared recursively using the same algorithm */export default function equal(a: unknown, b: unknown): boolean {  if (typeof a !== "object" && typeof b !== "object") return a === b;  if ((typeof a === "object") !== (typeof b === "object")) return false;  if (a === b) return true; // null or ref equality  if (a === null || b === null) return false;  if (Array.isArray(a) !== Array.isArray(b)) return false;
  if (Object.keys(a as any).length !== Object.keys(b as any).length) {    return false;  }
  return Object.entries(a as any).every(    ([k, v]) => k in (b as any) && equal(v, (b as any)[k]),  );}