Luatex (actually Aleph) and Bidi_Mirrored chars in RTL mode

[Khaled Hosny <khaledhosny@eglug.org>]

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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

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% engine=luatex 
\noheaderandfooterlines

\starttext

 \definefontfeature
   [arabic]
   [analyze=yes, clig=yes, curs=yes, dlig=yes,
    fina=yes, init=yes, isol=yes, kern=yes,
    language=dflt, liga=yes, mark=yes, medi=yes,
    mkmk=yes, mode=node, rlig=yes, script=arab]

\font \Arabic = ScheherazadeRegOT*arabic at 24pt

\pardir TRT \textdir TRT

\Arabic
(قوس) و <قوس> و [قوس] و  «قوس»
\stoptext 

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