one
fun NonNullableOptionBuilder<String>.oneOf(vararg allowed: String, ignoreCase: Boolean = true): NonNullableOptionBuilder<String>(source)
Restricts non-nullable string option to one of the specified allowed values.
fun OptionBuilder<String?>.oneOf(vararg allowed: String, ignoreCase: Boolean = true): OptionBuilder<String?>(source)
Restricts string option to one of the specified allowed values.