[Delayed Clipboard Rendering] How should dynamic content changes be handled?

With delayed clipboard rendering, serialization of the copied content is differed until it is actually needed. However, the content may change - ex. due to DOM mutations, style changes - after it is copied, but before it is pasted. How should copy serialization work when this happens?

Some thoughts:
If we undefer (ie. generate the clipboard data) as soon as a conflicting content change happens, this would prevent information loss, but may negate any benefit that delayed clipboard rendering provides.
If we continue to defer and perform a "live" serialization when requested, will the serialized content be useful to the user? Also, do we need a range object to keep track of the part of the page that was copied?