use str in to_array_object

Author: MarcoGorelli

spec/API_specification/dataframe_api/column_object.py

@@ -701,14 +701,26 @@ def fill_null(self: Column[DType], value: Scalar, /) -> Column[DType]:
         """
         ...
 
-    def to_array_object(self, dtype: Any) -> Any:
+    def to_array_object(self, dtype: str) -> Any:
         """
         Convert to array-API-compliant object.
 
         Parameters
         ----------
-        dtype : Any
+        dtype : str
             The dtype of the array-API-compliant object to return.
+
+            - bool
+            - int8
+            - int16
+            - int32
+            - int64
+            - uint8
+            - uint16
+            - uint32
+            - uint64
+            - float32
+            - float64
         
         Returns
         -------

spec/API_specification/dataframe_api/dataframe_object.py

@@ -817,14 +817,26 @@ def fill_null(
         """
         ...
 
-    def to_array_object(self, dtype: Any) -> Any:
+    def to_array_object(self, dtype: str) -> Any:
         """
         Convert to array-API-compliant object.
 
         Parameters
         ----------
-        dtype : Any
-            The dtype of the array-API-compliant object to return.
+        dtype : str
+            The dtype of the array-API-compliant object to return:
+
+            - bool
+            - int8
+            - int16
+            - int32
+            - int64
+            - uint8
+            - uint16
+            - uint32
+            - uint64
+            - float32
+            - float64
         
         Returns
         -------