Strange/incorrect matching

[enunez]

stringSimilarity.findBestMatch('wall e', ['wall·e', 'wall']);
stringSimilarity.findBestMatch('wall-e', ['wall·e', 'wall']);
stringSimilarity.findBestMatch('wall_e', ['wall-e', 'wall']);

These all return 1, as though "wall" is the best match. They should all return 0, since they differ by only 1 character and are more symbolically similar.