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Fixes #2868.
Some changes are made for consistency, while they may be unnecessary as algorithms can unwrap checked iterators.
Driven-by changes:
_At
member functions to makeoperator[]
,at
,front
,back
, and_Insert_n
clearer;shrink_to_fit
- previously it didn't support non-default-constructible allocators and might use a wrong memory resource denoted by the default-constructed allocator.