docs: @Override
      public void clearBody() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "clearBody");
          jmo.getPayloadPart().setChoiceField(JsPayloadAccess.PAYLOAD, JsPayloadAccess.IS_PAYLOAD_EMPTY);
          clearCachedLengths();
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "clearBody");
      }