Validates that the values described by rangeString are non-negative and in ascending order. Validation is skipped if rangeString is null.
Range to be validated
darg_plus.exception.ValidationError unless rangeString is null or 0 <= x && x < y.
validate
See Implementation
Validates that the values described by rangeString are non-negative and in ascending order. Validation is skipped if rangeString is null.