[luatex] bug in RTL typesetting?

[وفا خلیقی]

one more question, why if I use \setRTL at the beginning of the document it
does not works which is defined as

\newif\if at RTL
\if at RTL\pagedir TRT \bodydir TRT \pardir TRT \textdir TRT \else \pagedir TLT
\bodydir TLT \pardir TLT \textdir TLT \fi
\def\setRTL{\@RTLtrue}
\def\setLTR{\@RTLfalse}


but if I just say \pagedir TRT \bodydir TRT \pardir TRT \textdir TRT at the
beggining of a document, it works.

Should not these two work the same?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://tug.org/pipermail/luatex/attachments/20090329/39dd072b/attachment.html