[issue25370] Add support of pickling very large bytes and str objects with protocol < 4

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is preliminary patch. It doesn't include changes to tests. Some bigmem tests need to be changed.

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keywords: +patch
stage:  -> patch review
Added file: http://bugs.python.org/file40774/pickle_large_strings.patch

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