Compare structuredClone, JSON.parse(JSON.stringify()), and manual recursive cloning — covering circular references, special types like Date/Map/Set, functions, and performance.

Imagine you have a toy box with a special toy that has a secret note inside. structuredClone is like a magic copying machine that copies everything, even the secret note, while JSON is like a camera that only takes a picture of what it can see, missing some hidden things. Manual copying is like building the toy again piece by piece, which can be tricky if the toy has loops.