func RatioForStrings(source []rune, target []rune, op Options) float64 {
	matrix := MatrixForStrings(source, target, op)
	return RatioForMatrix(matrix)
}
func RatioForStrings(source []rune, target []rune, op Options) float64 {
	matrix := MatrixForStrings(source, target, op)
	return RatioForMatrix(matrix)
}
func RatioForStrings ( source [ ] rune , target [ ] rune , op Options ) float64 { matrix := MatrixForStrings ( source , target , op ) return RatioForMatrix ( matrix ) }
// RatioForStrings returns the Levenshtein ratio for the given strings. The
// ratio is computed as follows:
//
//     (sourceLength + targetLength - distance) / (sourceLength + targetLength)
RatioForStrings returns the Levenshtein ratio for the given strings . The ratio is computed as follows : ( sourceLength + targetLength - distance ) / ( sourceLength + targetLength )