[issue26175] Fully implement IOBase abstract on SpooledTemporaryFile

[Carey]

Change by Carey <carey at cmetcalfe.ca>:


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nosy: +pR0Ps
nosy_count: 6.0 -> 7.0
pull_requests: +27808
pull_request: https://github.com/python/cpython/pull/29560

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26175>
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