docs: public static Boolean exists(
              EvaluationContext ctx,
              Object tests,
              Object target) {
  
          if (!(tests instanceof List)) {
              if (tests == null) {
                  ctx.notifyEvt(() -> new ASTEventBase(FEELEvent.Severity.ERROR, Msg.createMessage(Msg.IS_NULL, "value"), null));
                  return null;
              }
              return applyUnaryTest(ctx, tests, target);
          }
  
          for (Object test : (List) tests) {
              Boolean r = applyUnaryTest(ctx, test, target);
              if (Boolean.TRUE.equals(r)) {
                  return true;
              }
          }
  
          return false;
      }