code: function() {
      this.addType(
        'interval',
        function(value) {
          if (value === null) return null
          return validator.toString(value + '')
        },
        {
          migration: ['interval'],
          operators: {
            defaults: ['eq', 'not']
          }
        }
      )
    }
docs: TODO: V2.1. probably use https://github.com/bendrucker/postgres-interval