Wrong processing of CharacterVariant for font Iosevka (working in xelatex)

[Rmano]

Install the font Iosevka; this is a direct link to the version I tested with: https://github.com/be5invis/Iosevka/releases/download/v10.1.1/super-ttc-iosevka-10.1.1.zip

and the MWE:

\documentclass[12pt]{article}
\usepackage{fontspec}
\setmonofont{Iosevka}[CharacterVariant={36:2, 26:6, 71:4}]
%
\begin{document}
\ttfamily
text in mono font 0123 4567 89 arrow: <- and shapes of AaAa; more words to add ``i'' (so few ies here\dots ¡and no k!)
\end{document}

Running with a current xelatex (This is XeTeX, Version 3.141592653-2.6-0.999993 (TeX Live 2021) (preloaded format=xelatex)) the result is the expected one (the "a" shape is a single-storey one):

with lualatex (This is LuaHBTeX, Version 1.13.2 (TeX Live 2021) ) I have:

I am not sure if it's user error, a font problem or a luaotfload error...

Removing the CharacterVariant switch gives a correct result.

[zauguin]

See Hans' answer on the ConTeXt list for some context on this: There is an intentional feature of the fontloader which uses the number as a factor to repeat the last character in a ligature and because of how the font is organized this also triggers here for the dot of the i. Anyway the latest fontloader no longer does this by default, so this is fixed in dev.

[Rmano]

@zauguin nice to know! Thank you for writing this here (I am not on the ConTeXt list...).
Closing it (correct?)!

BTW for people looking at this, the link to the mailing list thread is https://www.mail-archive.com/ntg-context@ntg.nl/msg99847.html