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First, the documentation says that syntax for 'O!' conversion is
object(type='name_of_Python_type'), but actually the type argument should be the name of C structure which represents Python type. I.e. object(type='list') is rejected, and object(type='PyList_Type') is accepted.
Second, from this declaration
/*[clinic]
module spam
spam.ham
 items: object(type='PyList_Type')
 /
[clinic]*/
Argument Clinic generates following parsing code:
 if (!PyArg_ParseTuple(args,
 "O!:ham",
 PyList_Type, &items))
 goto exit;
It is wrong, should be &PyList_Type.