bpo-34838: Perform a more easily branch-predictable type check by ammaraskar · Pull Request #9659 · python/cpython (original) (raw)
Why only tuple and dict? Same fast path would apply to all types with fast subclass flags from object.h (
Line 660 ine42b705
| /* These flags are used to determine if a type is a subclass. */ |
|---|
), including int, list, bytes, str, BaseException and type.