Current File : //usr/share/texlive/texmf-dist/fonts/misc/xetex/fontmapping/polyglossia/arabicdigits.map
; FC ... 
LHSName	"Digits"
RHSName	"ArabicDigits"

pass(Unicode)
U+0030 <> U+0660 ;
U+0031 <> U+0661 ;
U+0032 <> U+0662 ;
U+0033 <> U+0663 ;
U+0034 <> U+0664 ;
U+0035 <> U+0665 ;
U+0036 <> U+0666 ;
U+0037 <> U+0667 ;
U+0038 <> U+0668 ;
U+0039 <> U+0669 ;