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Description
Deque is often used as a buffer and buffers can be subject to "spiky" sizes; many elements may be buffered before being removed which can result in applications holding on to more memory than desired. Since the capacity of deque is an implementation detail, one way to reduce the size of the deque is asking it to shrink itself.
Related discussion #308
Detailed Design
Documentation
On the new method only.
Yes.
Testing
Performance
I didn't.
Source Impact
API addition only
Checklist