Jaro and JaroWinkler don't return a "Distance" they return a match score (from 0.0 to 1.0).

While LongestCommonSubsequence and LongestCommonSubstring don't really return a score/distance as such.

I guess the adding of a "Distance" sub module was to try and group interchangeable functions together and to try and "Self" Document.  (More Documentation is needed...), Probably should have called it EditDistance to match the one StdLib.  

BTW the Edit Distance in Std Lib is a Levenshtein with string trimming and limited to the first 255 Chars.