I really like #kotlin's (and others') approach to nullability, where nothing is nullable by default and you mark something as nullable by adding '?' to the type. And the '?.' syntax is nice too. 'foo: Foo? = ...; foo?.doThing()' is nicer than 'foo: Optional<Foo> = ...; foo.map(|it| it.doThing())', and both are miles better than "everything is always implicitly nullable unless annotated with '@NotNull' #plt
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