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Add NEWS entry
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‎Misc/NEWS.d/next/Core and Builtins/2022-03-19-21-47-36.bpo-44800.XnGKoD.rst

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Renamed `_PyInterpreterFrame` as `_Py_frame` to emphasise its close
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association with `PyFrameObject` (they're conceptually the same thing, but
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split into a Python object struct and a C data struct as a performance
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optimisation).
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The `f_` prefix has been removed from all `_Py_frame` fields that previously
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used it, so the presence or absence of the prefix provides a way to infer
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the exact type of a frame pointer when reading an isolated snippet in a code
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diff.

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