Albert did a great job at summarising the differences between both filters.

For a trip along memory lane; I have a long history of employing LaTeX math 
SVG Pandoc filters in production.
My first installment seems to date back to December 2013 
<https://stackoverflow.com/questions/41119436/pandoc-filter-mimicking-default-mathml-conversion>, 
with a second version published in this group in February 2015 
<https://groups.google.com/g/pandoc-discuss/c/MJggAXUmOII/m/PjkR8ILr_58J>. 
This is some months before John dabbled with this and explains the 
independent development tracks of both filters.

Finally, I was unaware of the SVG caching happening in John's Haskell 
filter.
Albert may be happy to read that he has a pull request waiting for him with 
SVG caching for my Lua filter.
Works a charm.

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