bpo-37812: Expand confusing CHECK_SMALL_INT so return is explicit. by gnprice · Pull Request #15216 · python/cpython
It's not obvious when looking at a call site of this macro that it affects the control flow. Move the `return` into the callers so it's explicit there, and factor out the fiddly bit as IS_SMALL_INT. As a bonus, a couple of other spots can also use IS_SMALL_INT with a benefit to clarity.
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