Flattens an RFC 8693 section 4.1 act chain into the actors' identifiers, the most recent first.
act
the nested { sub, act? } chain, or null
{ sub, act? }
the identifiers (empty for no chain), or null when it is not a chain a token model may carry
Flattens an RFC 8693 section 4.1
actchain into the actors' identifiers, the most recent first.