function isRecord(value: unknown): value is Record<string, unknown> {  return typeof value === "object" && value !== null && !Array.isArray(value);} export function stableStringify(value: unknown): string {  if (Array.isArray(value)) {    return `[${value.map(stableStringify).join(",")}]`;  }  if (isRecord(value)) {    return `{${Object.entries(value)      .filter(([, entryValue]) => entryValue !== undefined)      .sort(([left], [right]) => left.localeCompare(right))      .map(([key, entryValue]) => `${JSON.stringify(key)}:${stableStringify(entryValue)}`)      .join(",")}}`;  }  return JSON.stringify(value) ?? "null";}