Setting External Script Editor Args in Unity 5.5.2

Prior to 5.5.2, we had a script that set the 'External Script Editor Args' automatically to the desired value.

This was done using: EditorPrefs.SetString("kScriptEditorArgs", argString );

As of 5.5.2 this no longer works. Was the key changed to something else? Are these editorprefs documented somewhere?

 

Bump... this is really annoying. Anyone got any info?

 

If anyone comes across this, you can use the method InternalEditorUtility.SetExternalScriptEditorArgs(argString);