No longer possible to load caches using CLI?

[kpdecker]

./node_modules/hapi/node_modules/hoek/lib/index.js:425
    throw new Error(msgs.join(' ') || 'Unknown error');
          ^
Error: Invalid pack options  {
  "cache" [2, 3]: [
    null
  ]
}

[1] cache must be a Function
[2] cache must be an object
[3] cache position 0 fails because engine must be an object, engine must be a Function

    "pack": {
        "cache": [{
            "engine": "catbox-memory",
            "shared": true
        }]
    }

The migration guide states that this now must be an object or a function but does not elaborate on what sort of object is required to make this work when the source is a JSON file.