Possible Feature: Use lambda function for out_of_vocabulary_token_option about truecase HOT 3 OPEN

Yes, we can do that.

I would prefer extracting the logic to a member function out_of_vocabulary_handler and adding instructions to the readme on how users can override it with their own custom implementation.

What do you think?

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Yes, that's good. I'll work up an implementation.

In addition to out_of_vocabulary, an out_of_dictionary option could also be useful in a later update. This could be an early-stage way to differentiate between names and words that are simply not in the vocabulary

For example:
"hip-hop" is not in vocabulary, but is certainly a word. I would want it in lowercase.

However, my name (Keshav) is not in the vocabulary and won't be found in a dictionary. I'd want to capitalize "Keshav."

This certainly won't work for all names, as some names are words in the dictionary. eg: "Trump"

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Another thing to consider:
If the first word is classified as "out_of_vocabulary", then should we capitalize it, or just go along with the user's out_of_vocabulary_token_option.

Currently, it is the latter; however, I think we should capitalize it.

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