Improve bitap algorithm with obvious shortcuts #13
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
This patches python3 diff_match_patch.py to take two shortcuts in bitap score calculation. First, it does an integer comparison before forcing a cast to float, and second, if it gets a score of 0.0, it returns it.
All relevant tests pass, as I would expect, because one can demonstrate that this works just by reading the code carefully.
I know that this patch could be transfered to the C# version as well, I suspect that all versions have this inefficiency.