How to orderBy and ignore case

Using the current `orderBy` pipe, if you collection looks like:
```js
[{
  name: 'a'
}, {
  name: 'b'
}, {
  name: 'A'
}, {
  name: 'B'
}]
```
then the sorted result by `name` will be:
```js
[{
  name: 'A'
}, {
  name: 'B'
}, {
  name: 'a'
}, {
  name: 'b'
}]
```
How to avoid this without adding an extra lowered case property?