Luatexko breaks `\dots` and `\ldots` commands in text mode

[hammondkd]

Loading the luatexko package breaks the \ldots (and \dots) macros in text: both look like \cdots. This happens with non-default fonts in the Latin-alphabet text as well. A minimal example:

\documentclass{article}
\usepackage{luatexko}
\begin{document}
Hello\dots world.

Hello\ldots world.
\end{document}

Result:

Note that I am using a relatively old version (2022/11/01, as shipped with TeX Live 2023), so it is possible that this has already been fixed in a later version that I cannot currently run without building an entire TeX Live myself, but I did not see "dots" anywhere in the change log since 2022.

[dohyunkim]

\dots and \ldots are defined as follows in LaTeX kernel:

\DeclareRobustCommand{\dots}{%
   \ifmmode\mathellipsis\else\textellipsis\fi}
\let\ldots\dots

Both are, if not in math mode, expanded to \textellipsis in th end.

\textellipsis is defined as follows in tuenc.def (also part of LaTeX kernel):

\DeclareUnicodeSymbol{\textellipsis}{"2026}

In other words, \dots or \ldots is nothing other than the command to typeset the character U+2026.

By default, luatexko typesets U+2026 with Korean fonts, not with Latin fonts.
In Korean fonts, U+2026 is designed as something like \cdots.

The default behavior of luatexko can be changed by declaring this code:

\hangulpunctuations=0

or

\unregisterpunctuations{"2026}

then U+2026 will be typeset in Latin fonts.
The latter code affects U+2026 only, while the former affects other Latin punctuations as well.