[issue31993] pickle.dump allocates unnecessary temporary bytes / str

[Olivier Grisel]

Olivier Grisel <olivier.grisel at ensta.org> added the comment:

In my last comment, I also reported the user times (not spend in OS level disk access stuff): the code of the PR is on the order of 300-400ms while master is around 800ms or more.

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<https://bugs.python.org/issue31993>
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