code: function () {
      var seen = []
      return JSON.stringify(test, function (k, v) {
        if (typeof v !== 'object' || !v) return v
        if (seen.indexOf(v) !== -1) return undefined
        seen.push(v)
        return v
      })
    }
docs: 'custom 2': function () { return custom(test, 2, 0) }, 'customWs 2': function () { return customWs(test, 2, 0) },