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    (file/seek f &opt whence n)
    Jump to a relative location in the file. 'whence' must be one of
      :cur - jump relative to the current file location
      :set - jump relative to the beginning of the file
      :end - jump relative to the end of the file
    By default, 'whence' is :cur. Optionally a value n may be passed for
    the relative number of bytes to seek in the file. n may be a real
    number to handle large files of more the 4GB. Returns the file handle.

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