OptionalValidatedCharProperty
open class OptionalValidatedCharProperty(initialValue: Char?, bean: Any? = null, beanName: String? = null, validation: (ValidatedProperty<Char?>, Char?, Char?) -> Char?) : ValidatedProperty<Char?> , OptionalCharProperty
Boilerplate which avoids having to use generics.
Similar to ValidatedCharProperty, but the value can also be null.