Ronald Oussoren <ronaldousso...@mac.com> added the comment:

AFAIK you should specify the types of the fixed arguments for variadic 
functions. The ABI for the M1 has a different calling convention of the 
variadic arguments, the ctypes implementation counts how many variadic 
arguments there are based on the specified number of fixed arguments.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42880>
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