[issue1530559] struct.pack raises TypeError where it used to convert

[Meador Inge]

Meador Inge <meadori at gmail.com> added the comment:

> If anyone's interested in submitting a patch, it would be welcome.

Sure.  I saw where this was partly addressed in r78690.  The attached patch adds support for the '__index__' conversion that Mark
suggested.  

At first glance, the patch may seem more than what is needed.  However, most of the diffs are due to pulling parts of the C
implementation into a Python veneer.  This will make preprocessing work (like what was needs for this fix) easier now and in the future.  In addition, it will lay a small amount of groundwork for the changes that are needed for resolving issue 3132.  As that work will be simplified by having the veneer as well.

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nosy: +minge
Added file: http://bugs.python.org/file16476/issue-1530559.patch

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