Log Message:
textproc/hs-texmath: Update to 0.12.8.4

texmath (0.12.8.4)
  * TeX reader: ignore `\allowbreak` (#230).
  * TeX reader: handle `*{5}{lr}` in array column specifier (#229).
  * OMML reader: allow `m:e` to be missing in `m:nary` (#228).
    Technically this is not allowed, according to the spec, but
    Word and LibreOffice seem to tolerate it.

texmath (0.12.8.3)
  * OMML writer: use "on" and "off" instead of "1" \ 
and "0" for
    m:CT_OnOff type.  It is said that "1" and "0" work in Word
    but not Powerpoint.

texmath (0.12.8.2)
  * Typst writer: use binom instead of a fraction (jgm/pandoc#9063).

texmath (0.12.8.1)
  * Typst writer: several fixes (#223, Lleu Yang).
    + Escape quotes (") in inQuotes
    + Accent `\8407` corresponds to `arrow()`
    + Write `#none`'s for matrices with blanks at the beginning of a row

texmath (0.12.8)
  * Expose Text.TeXMath.Shared [API change]
  * Typst writer: Fix bug where 's' turned into 'space' (#219).
  * Typst writer: Fix handling of overline (#214).
  * Typst writer: Fix underbrace (#217).
  * Typst writer: Improve some accents (#216).
  * TeX writer: don't include \ on last line of matrix.
  * TeX writer: Remove escaping of spaces inside \text{}.
    It isn't needed, and it causes problems in MathJax rendering.
  * TeX reader: allow empty matrices.
  * MathML writer: Fix rendering of vectors (#218).
  * Depend on external typst-symbols package.

texmath (0.12.7.1)
 * Typst writer:
   + Improve under/overbrace/bracket/line.
   + Fix bugs with super/subscript grouping (#212).
   + Fix case where super/subscript is on an empty element,
     by inserting a zws.

texmath (0.12.7)
  * Add typst writer. New module: Text.TeXMath.Writers.Typst.
  * TeX reader: Support multilined environment. Closes #210.