Fix bug in slow tokenizer conversion, make it a lot faster (#24266)
* Make conversion faster, fix None vs 0 bug
* Add second sort for consistency
* Update src/transformers/convert_slow_tokenizer.py
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
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Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>