Absolute seeking on a StringIO treats the offset as a character count
regardless of the contents, so given that there is no "pretend it's UTF-8 and
advance a given number of 'bytes'" machinery anyway, there's no reason not to
allow seeking relative to the current location or the end of the 'file'. The
error message is also misleading: "Can't do nonzero cur-relative seeks" even
when the seek is relative to the end.
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