ReadOnlyOptionalFixedFormatPropertyWrapper
class ReadOnlyOptionalFixedFormatPropertyWrapper(wraps: OptionalFixedFormatProperty) : ReadOnlyPropertyWrapper<FixedFormat?, Property<FixedFormat?>> , ReadOnlyOptionalFixedFormatProperty
Boilerplate which avoids having to use generics.
Similar to ReadOnlyFixedFormatPropertyWrapper, but the value can also be null.