WeightedLevenshtein is not symmetric #244
Description
when using WeightedLevenshtein to compare two strings "sandler" and "wsandler", it got two different results 0.8571428571428572 and 0.7142857142857143
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when using WeightedLevenshtein to compare two strings "sandler" and "wsandler", it got two different results 0.8571428571428572 and 0.7142857142857143