[luatex] Vital RTL issues in LuaTeX

[وفا خلیقی]

This is a test file compiled in XeTeX. Let me say that if I do not use a
font in this test file in XeTeX, the number (21=twenty one) is printed
(12=twelve), but if I use a font, then this is done correctly as attached
pdf output while in LuaTeX if you declare a font or you dont, in both cases
you get the number in the wrong direction (get 12=twelve instead 21=twenty
one)

But \rightline in xetex is in the correct side but in luatex it is in the
wrong direction.
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