Optimize ascii(str): don't encode/decode repr if repr is already ASCII
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@ -451,6 +451,9 @@ PyObject_ASCII(PyObject *v)
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if (repr == NULL)
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return NULL;
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if (PyUnicode_IS_ASCII(repr))
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return repr;
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/* repr is guaranteed to be a PyUnicode object by PyObject_Repr */
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ascii = _PyUnicode_AsASCIIString(repr, "backslashreplace");
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Py_DECREF(repr);
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@ -6499,7 +6499,7 @@ _PyUnicode_AsASCIIString(PyObject *unicode, const char *errors)
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return NULL;
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/* Fast path: if it is an ASCII-only string, construct bytes object
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directly. Else defer to above function to raise the exception. */
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if (PyUnicode_MAX_CHAR_VALUE(unicode) < 128)
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if (PyUnicode_IS_ASCII(unicode))
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return PyBytes_FromStringAndSize(PyUnicode_DATA(unicode),
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PyUnicode_GET_LENGTH(unicode));
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return unicode_encode_ucs1(unicode, errors, 128);
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