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As the request with LS_op=destroy is part of the internal communication protocol, in principle, you may expect that the JavaScript Client Library will issue that request or not, depending on minor...

In library version 6 (where connect and disconnect are available) the API invocations are executed asynchronously, but anyway they are serialized.
A disconnect is instantaneous from the client point...

The reported request for control.js, with LS_op=destroy, can be made by the Client Library anytime a session gets closed.
The purpose is to make sure that the session is also closed on the server...