Method adjust_encoder_state_for_bom

crates/vm/src/stdlib/_io.rs:2892–2916

(
            encoder: &PyObjectRef,
            encoding: &str,
            buffer: &PyObject,
            vm: &VirtualMachine,
        )

        }

        fn adjust_encoder_state_for_bom(
            encoder: &PyObjectRef,
            encoding: &str,
            buffer: &PyObject,
            vm: &VirtualMachine,
        ) -> PyResult<()> {
            let needs_bom = matches!(encoding, "utf-8-sig" | "utf-16" | "utf-32");
            if !needs_bom {
                return Ok(());
            }
            let seekable = vm.call_method(buffer, "seekable", ())?.try_to_bool(vm)?;
            if !seekable {
                return Ok(());
            }
            let pos = vm.call_method(buffer, "tell", ())?;
            if vm.bool_eq(&pos, vm.ctx.new_int(0).as_ref())? {
                return Ok(());
            }
            if let Err(err) = vm.call_method(encoder, "setstate", (0,))
                && !err.fast_isinstance(vm.ctx.exceptions.attribute_error)
            {
                return Err(err);
            }
            Ok(())
        }

        #[allow(clippy::type_complexity)]
        fn find_coder(