It seems that you missed compile_fail tests which shows that is_filled wouldn't be propagated on Vec; and since ArrayVec implements Deref similarily, it wouldn't have is_filled either.
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This seems strictly less useful than an is_not_empty method (or !x.is_empty()) which fills the exact same use cases but can be used with Vec, ArrayVec, SmallVec, Box<[T]>, etc.
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