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Patch #1669331: clarify shutil.copyfileobj() behavior wrt. file position.
(backport from rev. 54202)
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@ -34,7 +34,9 @@ file type and creator codes will not be correct.
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is the buffer size. In particular, a negative \var{length} value
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means to copy the data without looping over the source data in
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chunks; by default the data is read in chunks to avoid uncontrolled
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memory consumption.
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memory consumption. Note that if the current file position of the
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\var{fsrc} object is not 0, only the contents from the current file
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position to the end of the file will be copied.
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\end{funcdesc}
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\begin{funcdesc}{copymode}{src, dst}
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