Can/Should Element insert(child:) be renamed to add(child:)

Is there a reason why this method isn't named `add`?

```
public func insert(child node: Node) {
    xmlAddChild(xmlNode, node.xmlNode)
}
```

The underlying API uses the term 'add'. To me `insert` means the method should take an index, or maybe the node will be put in the front of the children list.