[issue5438] test_bigmem.test_from_2G_generator uses more memory than expected

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +10355
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue5438>
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