bugfix: the tcp/stream cosocket object might hang when another concurrent request is accessing it while its operation is still in progress; now we always check for potential access conflicts and return the "socket busy" error string if it is indeed the case.
bugfix: the tcp/stream cosocket object might hang when another concurrent request is accessing it while its operation is still in progress; now we always check for potential access conflicts and return the "socket busy" error string if it is indeed the case.

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