Tokenizer defaults lowercase even when bert_model is cased
https://github.com/huggingface/pytorch-pretrained-BERT/blob/2152bfeae82439600dc5b5deab057a3c4331c62d/pytorch_pretrained_bert/tokenization.py#L77

A more clear behavior would be to use whether or not 'uncased' is in bert_model, and set the default behavior of do_lower_case accordingly.
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