Structured clone architecture significantly changed

# Domenic Denicola (2 months ago)

If your spec uses or hooks into structured clone, please be aware that we significantly changed its formulation in whatwg/html/commit/97d644c97335956610a31e8ad98d1a388c063e84 . The commit description describes the motivation and changes in great detail, so I won't repeat it here. This will require updates to any spec that uses or hooks into the structured cloning process, but the payoff is that it solves some long-standing bugs and will allow us to specify upcoming platform features like SharedArrayBuffer.

Please let me know, either by replying here or filing an issue on whatwg/html, if you need help adapting to the new infrastructure.

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