code: function all(nodes) {
    var index = -1;
    var length = nodes.length;
    var result = [];
    var value;
  
    while (++index < length) {
      value = one(nodes[index]);
  
      if (value && typeof value.length === 'number') {
        result = result.concat(value.map(one));
      } else {
        result.push(value);
      }
    }
  
    return clean(result);
  }
docs: /* Multiple nodes.