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The patch works against HEAD; updated for line numbers (there's a very 
similar set of line elsewhere in the file):

http://issola.caltech.edu/~t/transfer/patch-1067760-seek.diff

rhettinger thought the current behavior was reasonable (see bug 
1067728).  I'm not qualified to comment ;) but it seems odd that floats 
would have drastically different limits than longs.  This looks like a 
reasonable compromise IMO.