To support this sanely though wouldn't you need to know which language rule a
tsvector was generated with? Like, have a byte in the tsvector tagging it with
the language rule forever more?


No. As corner case, dictionary might return just a number or a hash value.



What I'm wondering about is if you use a different rule than what was used
when an index entry was inserted will you get different results using the
index than you would doing a sequential scan and reapplying the operator to
every datum?

Rules are apllyed during creattion of tsvector, not during indexing of tsvectors. So, sequential and index scan will return identical results.

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