This event is advisory only.
Event data is the handler object.
There is no default action to prevent.

The event is signalled by the handler during its finalisation of the instruction list.
At the time of signalling the instruction list is complete except for three instrucitons,
meta, document_start & document_end.

Syntax plugins could register for this event to finalise processing of their data knowing
it is complete, e.g. an alternate footnote plugin.

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