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Locally I confirmed this out put the same prompt_tokens as str_lookup.
In benchmarking in a Github codespace with 8 cores and 32 GB ram sorting took 6ms and getting prompt tokens of a few sentence prompt took 1ms. With old str_lookup getting the prompt tokens for the same prompt to 230ms.
The code can be cleaned up a lot when it becomes easier to have a pointer hold a locally defined struct with both the string and index.