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Fixes #1680.
I did a lil' investigation, and it seems like the RTD builds started failing on the mainline after #1560.
This is the last successful build and this is where it started failing.
I've noticed that RTD throws an error when it tries to build the epub format of the documentation:
python -m sphinx -T -W --keep-going -b epub -d _build/doctrees -D language=en . $READTHEDOCS_OUTPUT/epub
TODO: