🔀 MERGE: Internal improvements to the code base

[chrisjsewell]

Internal improvements, that should mainly not be noticed by users

[codecov]

Codecov Report

Merging #498 (f5f0b40) into master (9039a43) will decrease coverage by 0.12%.
The diff coverage is 97.50%.

@@            Coverage Diff             @@
##           master     #498      +/-   ##
==========================================
- Coverage   89.87%   89.75%   -0.13%     
==========================================
  Files          16       16              
  Lines        2075     2069       -6     
==========================================
- Hits         1865     1857       -8     
- Misses        210      212       +2     

Flag	Coverage Δ
pytests	89.75% <97.50%> (-0.13%)	⬇️

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Impacted Files	Coverage Δ
myst_parser/directives.py	81.53% <90.90%> (-0.43%)	⬇️
myst_parser/docutils_renderer.py	91.58% <98.18%> (-0.15%)	⬇️
myst_parser/html_to_nodes.py	89.79% <100.00%> (ø)
myst_parser/main.py	88.80% <100.00%> (ø)
myst_parser/mocking.py	86.05% <100.00%> (-0.54%)	⬇️
myst_parser/sphinx_renderer.py	93.14% <100.00%> (ø)

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