docs: private static DTDecisionRule toDecisionRule(EvaluationContext mainCtx, FEEL embeddedFEEL, int index, List<?> rule, int inputSize) {
          // TODO should be check indeed block of inputSize n inputs, followed by block of outputs.
          DTDecisionRule dr = new DTDecisionRule( index );
          for ( int i = 0; i < rule.size(); i++ ) {
              Object o = rule.get( i );
              if ( i < inputSize ) {
                  dr.getInputEntry().add( toUnaryTest( mainCtx, o ) );
              } else {
                  FEELEventListener ruleListener = event -> mainCtx.notifyEvt( () -> new FEELEventBase(event.getSeverity(),
                                                                                                       Msg.createMessage(Msg.ERROR_COMPILE_EXPR_DT_FUNCTION_RULE_IDX, index+1, event.getMessage()),
                                                                                                       event.getSourceException()));
                  embeddedFEEL.addListener(ruleListener);
                  CompiledExpression compiledExpression = embeddedFEEL.compile((String) o, embeddedFEEL.newCompilerContext());
                  dr.getOutputEntry().add( compiledExpression );
                  embeddedFEEL.removeListener(ruleListener);
              }
          }
          return dr;
      }