specify "normalization" in sys.FileSystem.fullPath

The current doc says the following:

``` haxe
/**
Returns the full path of the file or directory specified by `relPath`,
which is relative to the current working directory. Symlinks will be
followed and the path will be normalized.

If `relPath` is null, the result is unspecified.
**/
static function fullPath( relPath : String ) : String;
```

Could we please specify what _normalized_ exactly means here? Because apparently it's different from `haxe.io.Path.normalize` (e.g. it doesn't replace backslashes with slashes).