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We already have two implementations, combinedNgramOffset and binarySearchNgram, for the inverted index from ngrams to posting lists. With the btree I am working on, a third implementation will follow soon.
The current apporach guarantees a zero-value that won't panic in the tests, however, I don't think we should pile on top of that for the third implementation, but rather handle nil in the code and return an error where it makes sense.