pub trait AnyInternationalString {
// Required method
fn default_value(&self) -> Option<LanguageValueRef<'_>>;
// Provided methods
fn get_language(&self, _lang: &LangTag) -> Option<LanguageValueRef<'_>> { ... }
fn get_language_or_default(
&self,
lang: &LangTag,
) -> Option<LanguageValueRef<'_>> { ... }
}