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bpo-30040: update news entry (GH-12324)

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This optimization is not only for space, but also for speed.
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Inada Naoki 2019-03-14 18:54:09 +09:00 • committed by GitHub
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Misc/NEWS.d/next/Core and Builtins/2019-03-11-22-30-56.bpo-30040.W9z8X7.rst
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New empty dict uses fewer memory for now. It used more memory than empty
dict created by ``dict.clear()``. Patch by Inada Naoki.
dict created by ``dict.clear()``. And empty dict creation and deletion
is about 2x faster. Patch by Inada Naoki.