v4.3

use e-type instead of x-type in EXPL code

v4.2

use kernel's selectfont

v4.1

• assign U+223C (tilde operator) to \XeTeXcharclassSY (cjksymbols)
• avoid possible clash with unicode-math package

v4.0

• generalize the concept introduced at v3.9, that is \ifx\f@encoding\UTFencname now affects inter-character spacing as well as font substitution.
• guard against space character(catcode 12) in parsing code point of next character

v3.9

• substitution with hangul/hanja fonts will now occur only when \ifx\f@encoding\UTFencname is true. On plain TeX this is normally true as both are undefined.
• pronuntiation of U+4F53 is now CHEY.
• do not delay loading of konames-utf.sty

v3.8

• assign 0xAE and 0xB0 to XeTeXcharclassAA

v3.7

• fix position of dotemph regarding hangul tone marks
• enhance compatibility with ulem/ruby packages

v3.6

• LaTeX 2021/06/01 or later is required.
• vertical/horizontal environments now honor empty argument, which means natural width.
• new LaTeX environment: verticaltypesetting
• new plain TeX commands: \beginverticaltypesetting and \endverticaltypesetting

v3.5

• internal changes regarding font-switching method (remove Xeko@maybe@gobble)

v3.4

• internal changes regarding font-switching method