So the edn spec gives the following guidelines:
"If a reader encounters a tag for which no handler is registered, the
implementation can either report an error, call a designated 'unknown
element' handler, or create a well-known generic representation that
contains both the tag and the tagged element, as it sees fit. Note
that the non-error strategies allow for readers which are capable of
reading any and all edn, in spite of being unaware of the details of
any extensions present."

https://github.com/edn-format/edn

It would suffice then to have *unknown-element-handler* , and avoid
specifying the "well-known generic representation" for now if people
want to delay decisions on metadata and protocols.

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