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A reference to a received CefProcessMessage object and/or associated argument list can now be kept outside of the OnProcessMessageReceived callback. The argument list is no longer explicitly owned by the CefProcessMessage object and can be individually assigned to other CefValue types as needed (e.g. by passing to SetList, etc). Depending on client usage this could reduce the potential for unnecessary copies of the list contents. Received messages can also be sent back using SendProcessMessage (after which the CefProcessMessage would become invalid as discussed in issue #3123). This is not new behavior but we have now added explicit unit test coverage for it. This also no longer requires a copy of the argument list contents. Note that a received argument list is initially read-only for logical consistency. Assignment to another CefValue object could potentially remove the read-only status because it is not an intrinsic property of the underlying Chromium data type. This is fine because, at that point, ownership has been transfered to the new CefValue object and the original logical context (as part of the CefProcessMessage) no longer applies.