Description

What I want

A beautiful, predictable, uniform matrix of glyphs with one single, static, constant width.

When using xeCJK, all the requirement is a simple line:

\xeCJKsetup{PunctStyle=plain,RubberPunctSkip=false}

Current behavior

Chaotic width squeezing rules full of surprises.

Proposed API

#set text(cjk-punct-width: auto | "raw")

When set to auto, which is the default value, use the current behavior. When set to "raw", use the raw, unchanged, surpriseless, uniform width.

This option should not affect how the width of sequence —— is determined, whose glyph might from a ligature of the current font.

Workaround

#show regex("[，。、]"): it => box(width: 1em, align(left, it))
#show regex("[！？；：（）【】「」『』❲❳［］]"): it => box(width: 1em, align(center, it))

Mostly usable; might need further tweaking.

Use Case

Anyone migrating from XeLaTeX + xeCJK workflow will need this feature to have a fully comparable CJK environment.