Patch by Akira Kitada.

The new wording is based on the comments in the code, which
match the actual behavior.

"#3067: locale.setlocale() accepts a Unicode locale."

processes if negative or null.

Patch by July Tikhonov.

This makes them work like the close provided by regular file objects.  This
patch also backports the close-the-underlying-file code for _ProxyFile objects
that was introduced along with context manager support in the 3.x branch.

connection if its getresponse() method fails with a socket error. Patch written
by Ezio Melotti.

This allows findsource() to work in doctests.

A patch from Dirkjan Ochtman.

Original fix by 'rep', final patch (with tests) by Xuanji Li.

Rather than wrapping the C _isdir function in a Python function,
just import the C _isdir function directly. Additionally, add in the
docstring which was left out.