[NTG-context] Luatex (actually Aleph) and Bidi_Mirrored chars in RTL mode

Luatex does not mirror characters that has a Bidi_Mirrored property when the text direction is set to RTL (TRT in Aleph), according to http://unicode.org/reports/tr9/#Mirroring, the different types of parenthesis that has Bidi_Mirrored property should be mirreored in RTL mode, but this isn't what I get. Is this a bug, feature, or am I missing some thing? Thanks, Khaled -- Khaled Hosny Arabic localizer and member of Arabeyes.org team