Mohammad Hossein Bateni <bateni <at> gmail.com> writes:
You do not need to uninstall TeXLive. ConTeXt Standalone can work side by
side and it's very simple to install. You can pick to use the standalone for
some of your compilations.
\persiandecimals and \arabicdecimals are very similar. The difference is
(almost) only in digits for 0,4,5,6. However, Ibn Saeed most probably needs
\arabicdecimals to typeset "mashiriqi" numerals.
The important thing is that neither one exists in TeXLive Context. It was
there in MkII but not in MkIV for some reason. It was added to MkIV sometime
in the fall.
I updated ConTeXt as per your advice to the latest version.
I tried the following code on ConTeXt 0.63 running in AucTeX Spacemacs Editor.