[issue22995] Restrict default pickleability

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Was committed the restriction for tp_new == NULL.

New patch uses more complex condition for types that doesn't define any reduce-related methods. This case covers _csv.Dialect and memoryview (and buffer in 2.7, issue8323).

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Added file: http://bugs.python.org/file41024/pickle_restrictions_4.patch

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