Nothing can stop you from extracting QJSEngine code, renaming it to QV8Engine and making it a separate library.
I would assume the Trolls will want V4 to be as fast as V8. Since it's JIT, execution speed (of the compiled code at least) should be similar.But you are probably right that Qt wont maintain 2 scripting engines that basically do almost the same, just with different performance and platform compatibility.
So if there is a need for such a thing it would have to be some extern component maintained by some 3rd party.
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