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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