[issue8952] Doc/c-api/arg.rst: fix documentation of number formats

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

The other variable of interest here is that some integer formats will accept types with an __index__ method, while others won't.  I'm not sure which types fall into each category, right now.

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<http://bugs.python.org/issue8952>
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