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fun <T> CLIOption<T>.get(): Triple<CLIOption<T>, String?, () -> T?>
infix fun <T, V> CLIOption<T>.get(block: T.() -> V): Triple<CLIOption<T>, String?, () -> V?>
infix fun <T, V> SubCLIOption<T>.get(block: T.() -> V): Triple<CLIOption<T>, String?, () -> V?>