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fastcall

def fastcall[method_type: TrivialRegisterPassable, self_type: ImplicitlyDestructible, func: PyObjectFunction[method_type, self_type, func.has_kwargs], is_method: Bool, //](py_self_ptr: PyObjectPtr, args: UnsafePointer[PyObjectPtr, MutExternalOrigin], nargs: Int) -> PyObjectPtr

Returns:

PyObjectPtr