[issue25849] files, opened in unicode (text): write() returns symbols count, but seek() expect offset in bytes

[Martin Panter]

Martin Panter added the comment:

I think changing the TextIOBase API would be hard to do if you want to keep compatibility with existing code. I agree that encoding the position to a number and back seems like a bad design, but I doubt it is worth changing it at this point.

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<http://bugs.python.org/issue25849>
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