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It would be useful for tempfile.TemporaryFile and friends to pass
newline and encoding arguments to the underlying io.open call. For
example, several tests in test_csv use TemporaryFile and need to handle
unicode file output or preserve exact newlines. This is simpler with
direct support in TemporaryFile.
The attached patch makes the following changes:
 1) tempfile.TemporaryFile, NamedTemporaryFile, and SpooledTemporaryFile
 now pass newline and encoding to the underlying io.open call.
 2) test_tempfile is updated
 3) test_csv is updated to use the new arguments.