Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
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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: