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Correct - it won't change anything from 3.7.0, and even the original discrepancies relative to PEP 538 only affect applications that:
1. Are embedding a CPython runtime
2. *Aren't* already ensuring that they're running in a locale other than the C locale
3. Aren't able to set PYTHONCOERCECLOCALE=0 or LC_ALL=C in the environment prior to calling Py_Initialize() or Py_Main() in order to disable the locale coercion
(Because of the high quality of Victor's work on the UTF-8 mode implementation, it's practically impossible to externally distinguish between the behaviour of late coercion and the intended early coercion in the CPython CLI itself)