I just did a deep dive into this (pun intended). The name appears to date back well over a decade (probably longer) and has roots in lower-level browser APIs li

I just did a deep dive into this (pun intended). The name appears to date back well over a decade (probably longer) and has roots in lower-level browser APIs like the implementation of `postMessage`. > Structured cloning algorithm defines the semantics of copying a well-defined subset of ECMAScript objects between Code Realms. This algorithm is extensible by host enviroment to support cloning of host objects. https://github.com/dslomov/ecmascript-structured-clone https://github.com/dslomov/ecmascript-structured-clone Eventually, in 2015, it was suggested to expose the `structuredClone` algorithm as an API: > Has anyone ever proposed exposing the structured clone algorithm directly as an API? Katelyn Gadd was musing about fast deep copy in JS on Twitter, and I proposed a hack to use postMessage to do so[1], which works but it's a little roundabout. Since structured clone is a primitive that the web platform is built on it seems like a primitive that ought to be exposed. I know this exists in other languages (Python has copy.deepcopy[2]) and there's an npm "deepcopy" module[3] with lots of downloads so this is clearly something people use. https://lists.w3.org/Archives/Public/public-webapps/2015AprJun/0251.html https://lists.w3.org/Archives/Public/public-webapps/2015AprJ...