This validator failed as non existent (!) 

```
  1) [MYSQL] DaoValidator validations correctly specifies an instance as invalid using a value of "22" for the validation "isArray":
     Uncaught Error: Invalid validator function: isArray
      at prepareValidationOfAttribute (/Users/thanpolas/Projects/libs/sequelize/lib/dao-validator.js:193:13)
      at null.<anonymous> (/Users/thanpolas/Projects/libs/sequelize/lib/dao-validator.js:117:50)
      at forOwn (/Users/thanpolas/Projects/libs/sequelize/node_modules/lodash/dist/lodash.js:1907:15)
      at Function.forEach (/Users/thanpolas/Projects/libs/sequelize/node_modules/lodash/dist/lodash.js:3044:9)
      at validateAttribute (/Users/thanpolas/Projects/libs/sequelize/lib/dao-validator.js:116:11)
      at /Users/thanpolas/Projects/libs/sequelize/lib/dao-validator.js:107:56
      at forOwn (/Users/thanpolas/Projects/libs/sequelize/node_modules/lodash/dist/lodash.js:1907:15)
      at Function.forEach (/Users/thanpolas/Projects/libs/sequelize/node_modules/lodash/dist/lodash.js:3044:9)
      at validateAttributes (/Users/thanpolas/Projects/libs/sequelize/lib/dao-validator.js:101:11)
      at null.fct (/Users/thanpolas/Projects/libs/sequelize/lib/dao-validator.js:20:24)
      at null.<anonymous> (/Users/thanpolas/Projects/libs/sequelize/lib/emitters/custom-event-emitter.js:24:18)
      at processImmediate [as _immediateCallback] (timers.js:330:15)
```