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* '0.4' of https://github.com/bluss/arrayvec: 0.4.9 TEST: Add test that ensures the MaybeUninit impl is used on nightly FIX: Remove use of uninitialized in ArrayString FEAT: Implement a "MaybeUninit" and use it conditionally TEST: Add test that Some(ArrayVec<[&_;_]>).is_some() MAINT: Test the 0.4 branch in travis