ZWJ and Turkish

I was wondering how should a standard compliant engine render

	<span lang="tr">f&zwj;i</span>

in a font that has the 'fi' ligature:

1) What do you mean? It is Turkish! "fi" should never be ligated in
Turkish...

2) But can't you see the ZWJ? I'm explicitly asking for the ligature. I
need it!

roozbeh