reference_levdist  106 ext/standard/levenshtein.c 			distance = reference_levdist(str1, str1_len, str2, str2_len, 1, 1, 1);
reference_levdist  113 ext/standard/levenshtein.c 			distance = reference_levdist(str1, str1_len, str2, str2_len, cost_ins, cost_rep, cost_del);