FieldRef.Optional

Evaluates to true if this field is to be considered optional (does not need to be present in the YAML document)

template FieldRef(alias T, string name, bool forceOptional = false)

enum Optional = forceOptional || hasUDA!(Ref, CAOptional) || is(immutable(Type) == immutable(bool)) || is(Type : SetInfo!FT, FT) || (Default != Type.init);

FieldRef.Optional

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