Most of the time the purpose of deep cloning objects is deep cloning data structures.
It's been discussed that generically deep cloning proxies, privates and functions is a non-trivial problem. However it would be of value to have a mechanism to deep clone anything that would be valid JSON (Limiting to JSON is arbitary, it's a well defined subset and none of the subset would involve difficult points to resolve). This gives us - An efficient deep clone implementation in the js engine - Solves difficulties with deep cloning by disallowing difficult objects from being deep cloned. - gets rid of every clone function that every library has. I presume this would literally be a highly optimised version of JSON.parse(JSON.stringify(o)). Potential issues - subset of JSON is too restricted to be useful - Proxies/private state may cause issues (the same issues would apply to JSON.stringify ?) - What's the value of the [[Prototype]] of the clone? (JSON.parse uses the standard [[Prototype]] for the stringified object) - Do we expect anything sensible to happen with host objects? (JSON.parse returns objects with few or no properties for host objects) - Do we solve cyclic references? (JSON.parse fails on them)
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