[issue31718] some methods of uninitialized io.IncrementalNewlineDecoder objects raise SystemError

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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nosy: +ZackerySpytz
nosy_count: 5.0 -> 6.0
pull_requests: +18006
pull_request: https://github.com/python/cpython/pull/18640

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31718>
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