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Added comments about the weak reference support.
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Misc/NEWS

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@@ -13,6 +13,12 @@ Core language, builtins, and interpreter
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- Functions are now compared and hashed by identity, not by value, since
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the func_code attribute is writable.
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- Weak references (PEP 205) have been added. This involves a few
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changes in the core, an extension module (_weakref), and a Python
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module (weakref). The weakref module is the public interface. It
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includes support for "explicit" weak references, proxy objects, and
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mappings with weakly held values.
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Standard library
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- mailbox.py now has a new class, PortableUnixMailbox which is

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