1. Fixed _write_float to handle infinity, NaN and negative numbers correctly.
2. Renamed _write_long to _write_ulong because it actually writes unsigned value.
3. Added _read_ushort as counterpart of _write_ushort. This is never used anywhere except test that ushorts are written correctly. But it seems right to me to have both read and write function in the same module.

Patch must be applied after http://bugs.python.org/file23931/test_aifc.patch from issue 13394.
Not sure if review tool can handle this correctly.

Second patch goes to issue 13589

Forget about "patch must be applied before" thing.
I've made independent patch. :-)

For the record, can you explain why infinity and NaN can end up in AIFC files?
That said, the patch looks ok to me.

I have absolutely no idea :-)
I just covered every line of code with tests. Some bugs prevented me from do it, so I fixed them.

New changeset f715c4a5a107 by Antoine Pitrou in branch '3.2':
Issue #13589: Fix some serialization primitives in the aifc module.
http://hg.python.org/cpython/rev/f715c4a5a107

New changeset b039965b0066 by Antoine Pitrou in branch 'default':
Issue #13589: Fix some serialization primitives in the aifc module.
http://hg.python.org/cpython/rev/b039965b0066

New changeset 8fac90d0f4cd by Antoine Pitrou in branch '2.7':
Issue #13589: Fix some serialization primitives in the aifc module.
http://hg.python.org/cpython/rev/8fac90d0f4cd

I've finally committed the patch, thank you!