raised an error.

Replace them with using concrete types API that never fails if appropriate.

Fixed segmentation fault in sqlite3.Row constructor with faked cursor type.
Fixed system error in the comparison of faked types.SimpleNamespace.

Replace it with PyUnicode_GET_LENGTH() or PyUnicode_AsUnicodeAndSize()

The result type is int, return -1 to avoid a compiler warning (cast Py_ssize_t
to int).  PyObject_Size() can only fail with -1, and anyway a constructor
should return -1 on error, not an arbitrary negative number.

Issue 14673: Add sys.implementation