Some kind of an optional/variant type, enforced by the type system.
Or if even that feels too verbose, just a 'nullable' modifier on the variable or field definition, with the default being not nullable.
(Although Optional/Maybe types are definitely my preference based on the languages I've used)
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Or if even that feels too verbose, just a 'nullable' modifier on the variable or field definition, with the default being not nullable.
(Although Optional/Maybe types are definitely my preference based on the languages I've used)