The gfm_auto_identifiers extension affects readers, not writers
(that's why it's not doing anything when you try to attach it
to the writer).
The identifiers are generated in the parsing phase.
Unfortunately, the docx reader doesn't support it (currently ...
perhaps it wouldn't be hard to add this).
A workaround might be going docx -> markdown, then
markdown+gfm_auto_identiifers -> gfm.
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