docs: function convertArray(arr, pluralize, opts) {
    if (arr.length !== pluralize.count) throw new Error('missing required length of plural formats: expected ' + pluralize.count + '; got ' + arr.length);
  
    return pluralize.formats.reduce(function(acc, key, i) {
      acc[key] = arr[i];
      return acc;
    }, {});
  }