v5.7

• fix the routine for getting a dotemph box

v5.5

• new font option InterCharPenalty
• revise \inhibitglue using token.set_lua
• fix protrusion value for harf-mode vertical writing

v5.4

• more efficient tagging for vertical environment

v5.3

• reset hb.space and parameters.space for harf-mode fonts:
  the width of inter-word space can be affected by this fix.
• consider extend/squeeze option in vertical font setting:
  currently these two options do not work properly with node-mode vertical font.

v5.2

• new tagging plug for \uuline
• copy node attributes of leader box/rule to leader glue
• fix a bug in fontoptions.asc_desc[]

v5.1

• fix a bug regarding uline tagging

v5.0

• improve \xxruby command using lua-uni-algos package
• improve ruby process by integrating separate processes
• improve uline process considering space glyph inserted by tagpdf package

v4.9

• support vertical writing with harfbuzz-mode font
• deactivate compresspunctuations when halt/vhal font feature is given
• restore calling of hb.font.get_glyph_extents() using memory cache
• avoid loss of illegal sequence of hangul jamo

v4.8

• add fullwidth numbers/letters to is_hanja()
• allow glue stretching before/after non-breakable cjk characters
• bypass hb.font.get_glyph_extents() for speed-up, so a little larger italic correction value for harf-mode fakeslant fonts

v4.7

• redact remove_classic_spaces function
• insert no glue to the outermost node in a classic-mode box
• insert penalty between non-glyph box and cjk char in classic mode