https://github.com/whatwg/html/pull/4734 has a design for solving this issue from the API side. The implementation is likely more involved as we cannot decide when deserializing, but we need to decide when crossing the process boundary. (And this might be even more involved with MessageChannel as a MessagePort can go across various process boundaries before the underlying messaged objects are retrieved.)
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https://github.com/whatwg/html/pull/4734 has a design for solving this issue from the API side. (Review appreciated!) The implementation is likely more involved as we cannot decide when deserializing, but we need to decide when crossing the process boundary. (And this might be even more involved with MessageChannel as a MessagePort can go across various process boundaries before the underlying messaged objects are retrieved.)