code: static void clearPartnerLevel() {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(tc, "clearPartnerLevel");
      partnerLevel.set(null);
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(tc, "clearPartnerLevel");
    }
docs: /*
  Clear the 'protocol version' of the connection partner for any current encode
  on this thread.
  
  This method has package access as it is called by JsMessageObject