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SpooledTemporaryFile.__iter__()exposes the underlying stream, which can become stale or closed when the file rolls over. Use the IOBase iterator so iteration follows the current stream. Cover text/binary rollover, iterator identity, position, and closed files.Fixes #87034.
Validation (Windows debug build):
test_tempfileandtest_smtplibpassed together (208 tests run, 6 skipped); the rollover and identity regressions failed before the fix. The isolated patch applies cleanly to the base revision.