[issue5016] FileIO.seekable() can return False

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Patch with regression test in test_largefile: test 2**31-1, 2**31, 
2**31+1.

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keywords: +patch
nosy: +haypo
Added file: http://bugs.python.org/file12821/fileio_append.patch

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