I used this to test locally
You can uncomment: and add my changes to ./store.js to see reverse working

<script src="https://cdn.jsdelivr.net/npm/gun/gun.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gun/sea.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gun/lib/radix.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gun/lib/radisk.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gun/lib/store.js"></script>
<!--script src="./store.js"></script-->
<script src="https://cdn.jsdelivr.net/npm/gun/lib/rindexed.js"></script>
<script>
  (async () => {
    var arr = [
      'Adalard',
      'Adora',
      'Aia',
      'Albertina',
      'Alfie',
      'Allyn',
      'Amabil',
      'Ammamaria',
      'Andy',
      'Anselme',
      'Ardeen',
      'Armand',
      'Ashelman',
      'Aube',
      'Averyl',
      'Baker',
      'Barger',
      'Baten',
      'Bee',
      'Benia',
      'Bernat',
      'Bevers',
      'Bittner',
      'Bobbe',
      'Bonny',
      'Boyce',
      'Breech',
      'Brittaney',
      'Bryn',
      'Burkitt',
      'Cadmann',
      'Campagna',
      'Carlee',
      'Carver',
      'Cavallaro',
      'Chainey',
      'Chaunce',
      'Ching',
      'Cianca',
      'Claudina',
      'Clyve',
      'Colon',
      'Cooke',
      'Corrina',
      'Crawley',
      'Cullie',
      'Dacy',
      'Daniela',
      'Daryn',
      'Deedee',
      'Denie',
      'Devland',
      'Dimitri',
      'Dolphin',
      'Dorinda',
      'Dream',
      'Dunham',
      'Eachelle',
      'Edina',
      'Eisenstark',
      'Elish',
      'Elvis',
      'Eng',
      'Erland',
      'Ethan',
      'Evelyn',
      'Fairman',
      'Faus',
      'Fenner',
      'Fillander',
      'Flip',
      'Foskett',
      'Fredette',
      'Fullerton',
      'Gamali',
      'Gaspar',
      'Gemina',
      'Germana',
      'Gilberto',
      'Giuditta',
      'Goer',
      'Gotcher',
      'Greenstein',
      'Grosvenor',
      'Guthrey',
      'Haldane',
      'Hankins',
      'Harriette',
      'Hayman',
      'Heise',
      'Hepsiba',
      'Hewie',
      'Hiroshi',
      'Holtorf',
      'Howlond',
      'Hurless',
      'Ieso',
      'Ingold',
      'Isidora',
      'Jacoba',
      'Janelle',
      'Jaye',
      'Jennee',
      'Jillana',
      'Johnson',
      'Josy',
      'Justinian',
      'Kannan',
      'Kast',
      'Keeley',
      'Kennett',
      'Kho',
      'Kiran',
      'Knowles',
      'Koser',
      'Kroll',
      'LaMori',
      'Lanctot',
      'Lasky',
      'Laverna',
      'Leff',
      'Leonanie',
      'Lewert',
      'Lilybel',
      'Lissak',
      'Longerich',
      'Lou',
      'Ludeman',
      'Lyman',
      'Madai',
      'Maia',
      'Malvina',
      'Marcy',
      'Maris',
      'Martens',
      'Mathilda',
      'Maye',
      'McLain',
      'Melamie',
      'Meras',
      'Micco',
      'Millburn',
      'Mittel',
      'Montfort',
      'Moth',
      'Mutz',
      'Nananne',
      'Nazler',
      'Nesta',
      'Nicolina',
      'Noellyn',
      'Nuli',
      'Ody',
      'Olympie',
      'Orlena',
      'Other',
      'Pain',
      'Parry',
      'Paynter',
      'Pentheas',
      'Pettifer',
      'Phyllida',
      'Plath',
      'Posehn',
      'Proulx',
      'Quinlan',
      'Raimes',
      'Ras',
      'Redmer',
      'Renelle',
      'Ricard',
      'Rior',
      'Rocky',
      'Ron',
      'Rosetta',
      'Rubia',
      'Ruttger',
      'Salbu',
      'Sandy',
      'Saw',
      'Scholz',
      'Secor',
      'September',
      'Shanleigh',
      'Shenan',
      'Sholes',
      'Sig',
      'Sisely',
      'Soble',
      'Spanos',
      'Stanwinn',
      'Stevie',
      'Stu',
      'Suzanne',
      'Tacy',
      'Tanney',
      'Tekla',
      'Thackeray',
      'Thomasin',
      'Tilla',
      'Tomas',
      'Tracay',
      'Tristis',
      'Ty',
      'Urana',
      'Valdis',
      'Vasta',
      'Vezza',
      'Vitoria',
      'Wait',
      'Warring',
      'Weissmann',
      'Whetstone',
      'Williamson',
      'Wittenburg',
      'Wymore',
      'Yoho',
      'Zamir',
      'Zimmermann',
    ];

    const gun = Gun();

    let keys = JSON.parse(localStorage.getItem('testKeys'));

    if (!keys) {
      keys = await Gun.SEA.pair();
      localStorage.setItem('testKeys', JSON.stringify(keys));
      console.log('keys stored');
    }

    const insert = (node, data, i) =>
      new Promise((resolve, reject) => {
        node
          .get(data)
          .put({ name: data, age: i }, (ack) =>
            ack.err ? reject(ack.err) : resolve()
          );
      });

    gun.on('auth', async () => {
      // for (let i = 0; i < arr.length; i++) {
      //   await insert(user.get('index'), arr[i], i);
      // }
      console.log('Show items in reverse');
      user
        .get('index')
        .get({ '.': { '*': 'A' }, '%': 50000, '-': 1 })
        .map()
        .on((node, v, k) => {
          console.log(v);
        });
    });

    var user = gun.user();
    await user.auth(keys);
  })();
</script>

@alterx yay for helping fix bugs! Very much appreciated.

The fact Martti can run this with Iris and no problems is a big win / indication it is correct.

Sorry I've been bogged down. When we chatted the other day it seems like mocha in the browser also had the same failure as NodeJS, so we should review that before pulling (bleeh ugh I hate saying this). I 100% predict it is bug in my code tho, not yours. My mental state hasn't been very good tho to see why (tho I'm excited jibbery that you've done this!), so is it OK if I don't pull quite yet? I feel sad I've been the bottleneck :(

@amark no problem, I need to find some time to figure out why this is not working inside the test. I definitely think we should wait until there's at least one functional unit test, this way it won't break again in the future.

One thing that's worth noting is that the previous test was being explicitly skipped, maybe an indication that this issue with testing reverse happened before?