New GitHub issue #100931 from sobolevn:<br>

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While working on https://github.com/python/cpython/issues/100817 I've noticed that `slice` is only tested with 3 `pickle` protocols. See https://github.com/python/cpython/blob/8dd2766d99f8f51ad62dc0fde8282483590c6cd0/Lib/test/test_slice.py#L237-L243 I don't think we need to limited supported protocols. Let's test all protocols!
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<a href="https://github.com/python/cpython/issues/100931">View on GitHub</a>
<p>Labels: type-bug, tests</p>
<p>Assignee: sobolevn</p>