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_GzipReader.seekable() returned fp.seekable(), so io.BufferedReader refused tell() and seek() on pipes and sockets. Return True, as gzip._PaddedFile.seekable() does: seek() reads forward and calls fp.seek() only to rewind.
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On an
IGzipFilethat reads from an unseekable file object, such as a pipe or a socket,tell()andseek()raiseio.UnsupportedOperation.gzip.GzipFilesupportstell()and forward seeks on the same input.io.BufferedReaderrejects both calls because_GzipReader.seekable()insrc/isal/isal_zlibmodule.creturnsfp.seekable(). This change makes_GzipReader.seekable()returnTrue, asgzip._PaddedFile.seekable()does; a rewind still callsfp.seek(), as ingzip. The newtest_tell_and_seek_forward_on_unseekable_filetest fails on develop.Checklist