STINNER Victor <vstin...@redhat.com> added the comment:

> This is because PyUnicode_DecodeFSDefaultAndSize calls 
> _PyInterpreterState_GET_UNSAFE(), which already documents the potential NULL 
> return value. 

_PyInterpreterState_GET_UNSAFE() is preferred over other functions getting the 
interpreter for best performances. _PyInterpreterState_GET_UNSAFE() is the most 
efficient way to access the interpreter. That's why I was talking about the 
cost of additional checks (to detect API misuage) at runtime.

> Understood, happy for this to be closed. Aware that I was misusing the API :-)

I close the issue.

----------
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36386>
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