If you change this you break a common optimization: https://github.com/python/cpython/blob/3.14/Lib/json/encoder.py#L267 https://github.com/python/cpython/blob

If you change this you break a common optimization: https://github.com/python/cpython/blob/3.14/Lib/json/encoder.py#L267 https://github.com/python/cpython/blob/3.14/Lib/json/encoder... Default value is evaluated once, and accessing parameter is much cheaper than global