chore(serde_v8): take mutable reference in ToV8::to_v8
#15707
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Currently, its not possible to mutatate return value during serialization stage; which is required to support V8 external strings that take ownership of the bytes. Ideally,
to_v8should take ownership but that doesn't seem possible. With this patch, you could useOption::taketo take ownership (& leak)ByteString, etc insideto_v8.