CID 486663

CID 486250

Issue #18513: Add workaround for OS X 10.8 cexp bug that leads to wrong cmath.rect(0.0,-0.0) results.

CID 719637

CID 486659

CID 486654

CID 486649

CID 486647

whereas the fchmodat() function is not avaialble.

supports running only selected tests.  Patch by Zachary Ware.

Original patch by Zachary Ware.

Useed context managers for file I/O.
Removed out-of-dated code and misleading comments.

Patch by Vajrasky Kok.

Zachary Ware.)

  object's custom `__hash__()` method.

Févry Thibault.

Phil Webster. With that available, modify RstripExtension.py to stop deleting
null slices, which caused a file to be marked as changed when it was not.

Based on patches by Todd.Rovito and Phil Webster.

Initial patch by Madison May.

There is more to be done here in terms of accepting RFC invalid
input that some mailers accept, but this covers the valid
RFC places where encoded words can occur in structured headers.

The problem was I was only checking for decimal digits after the third '?',
not for *hex* digits :(.

This changeset also fixes a couple of comment typos, deletes an unused
function relating to encoded word parsing, and removed an invalid
'if' test from the folding function that was revealed by the tests
written to validate this issue.