For optional arguments Option.HasConjoinedArg can be used to determine if
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should be a really good reason when deviating from that expectation.
My response was to abandon trying to intercept at the level of individual elements and instead intercept at the level of the browser’s own property descriptors. I went straight for HTMLMediaElement.prototype with Object.getOwnPropertyDescriptor, hooking the native src and srcObject setters before any page code could run: