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-rw-r--r--Misc/NEWS.d/next/Core and Builtins/2019-10-29-15-44-24.bpo-38613.V_R3NC.rst3
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+Optimized some set operations (e.g. ``|``, ``^``, and ``-``) of
+``dict_keys``. ``d.keys() | other`` was slower than ``set(d) | other`` but
+they are almost same performance for now.