/**
 * Deep-copies a value, preserving as much fidelity as practical:
 *
 * - Arrays, Sets, and Maps are reconstructed with their native types.
 * - Prototype chain is preserved (class instances stay `instanceof`
 *   their class).
 * - Own string AND symbol keys are copied, including non-enumerable
 *   properties and full descriptor attributes (writable, enumerable,
 *   configurable).
 * - Accessor descriptors are snapshotted: the getter is invoked once
 *   (inside `untrack` so reactive reads don't leak) and the result is
 *   stored as data on the copy. The original accessor shape is lost —
 *   copy returns a value snapshot, not a live recomputing view.
 * - Cycles are handled via the `seen` map.
 * - Frozen / sealed / non-extensible state is re-applied.
 * - Built-ins listed in `isMutationBlacklisted` (Date, RegExp,
 *   HTMLElement, …) are returned by reference.
 *
 * @template T
 * @param {T} o
 * @returns {T}
 * @url https://pota.quack.uy/store/copy
 */
export function copy<T>(o: T, seen?: Map<any, any>): T;
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