Multiline matching works with \r\n only on JS and Flash?

Test code:
```haxe
class Main {
static function main() {
trace(~/^\d$/gm.replace("1\r\n2\r\n~", "?"));
}
}
```
From my tests (@3b4c330):
Works on: JS, Flash
Does not work on: Neko, C++, C#.

Is this intentional? If so, should the documentation mention it?