Why doesn't structuredClone copy Function Object?

Question

MDN says that "Function objects cannot be duplicated by the structured clone algorithm; attempting to throws a DataCloneError exception."

Why does copying a function object emit an error with structuredClone()?

Answer 1

If you read on MDN/structuredClone, it says

Exceptions

DataCloneError DOMException

• Thrown if any part of the input value is not serializable.

For why functions are not serializable, see here: Why is a function not serializable?

From what I understand of those answers, the TL;DR is that it's because a function can be converted to a string, but the variables/functions referenced in the function that are out of scope would cause issues.