diff --git a/pyo3-polars-derive/src/lib.rs b/pyo3-polars-derive/src/lib.rs
index be4c8f3..166708c 100644
--- a/pyo3-polars-derive/src/lib.rs
+++ b/pyo3-polars-derive/src/lib.rs
@@ -28,6 +28,7 @@ fn quote_get_kwargs() -> proc_macro2::TokenStream {
     let kwargs = match pyo3_polars::derive::_parse_kwargs(kwargs)  {
         Ok(value) => value,
         Err(err) => {
+            let err = polars_err!(InvalidOperation: "could not parse kwargs: '{}'\n\nCheck: registration of kwargs in the plugin.", err);
             pyo3_polars::derive::_update_last_error(err);
             return;
         }
@@ -220,7 +221,7 @@ fn create_field_function(
         )
     } else {
         quote!(
-                let result = #dtype_fn_name(&inputs);
+            let result = #dtype_fn_name(&inputs);
         )
     };
 
@@ -240,7 +241,7 @@ fn create_field_function(
 
                 match result {
                     Ok(out) => {
-                        let out = polars_core::export::arrow::ffi::export_field_to_c(&out.to_arrow());
+                        let out = polars_core::export::arrow::ffi::export_field_to_c(&out.to_arrow(true));
                         *return_value = out;
                     },
                     Err(err) => {
@@ -277,7 +278,7 @@ fn create_field_function_from_with_dtype(
             let mapper = polars_plan::dsl::FieldsMapper::new(&inputs);
             let dtype = polars_core::datatypes::DataType::#dtype;
             let out = mapper.with_dtype(dtype).unwrap();
-            let out = polars_core::export::arrow::ffi::export_field_to_c(&out.to_arrow());
+            let out = polars_core::export::arrow::ffi::export_field_to_c(&out.to_arrow(true));
             *return_value = out;
         }
     )
diff --git a/pyo3-polars/src/lib.rs b/pyo3-polars/src/lib.rs
index 237b796..7d61c62 100644
--- a/pyo3-polars/src/lib.rs
+++ b/pyo3-polars/src/lib.rs
@@ -123,7 +123,7 @@ impl<'a> FromPyObject<'a> for PySeries {
         let name = ob.getattr("name")?;
         let name = name.str()?.to_str()?;
 
-        let arr = ob.call_method0("to_arrow")?;
+        let arr = ob.call_method1("to_arrow", (true,))?;
         let arr = ffi::to_rust::array_to_rust(arr)?;
         Ok(PySeries(
             Series::try_from((name, arr)).map_err(PyPolarsErr::from)?,
@@ -162,7 +162,7 @@ impl IntoPy<PyObject> for PySeries {
     fn into_py(self, py: Python<'_>) -> PyObject {
         let s = self.0.rechunk();
         let name = s.name();
-        let arr = s.to_arrow(0);
+        let arr = s.to_arrow(0, true);
         let pyarrow = py.import("pyarrow").expect("pyarrow not installed");
         let polars = py.import("polars").expect("polars not installed");