_.cloneDeep behavior with custom class instances and prototype preservation

The _.cloneDeep function in lodash is designed to recursively clone nested objects, arrays, and ES6 collections like Map and Set while managing circular references to prevent stack overflows.

A specific design constraint exists regarding prototype chains. While the function creates new instances of built-in types, it primarily clones enumerable own properties. This creates uncertainty when dealing with custom class instances where the constructor association and inherited methods are critical to the object's functionality.

If a custom class instance is passed to _.cloneDeep, the resulting object may be converted to a plain JavaScript object, stripping the original prototype chain.

• Does _.cloneDeep provide a mechanism to preserve the prototype of custom class instances?
• In which version of lodash was the behavior for custom constructor preservation finalized?