remove redundant setitem logic

Author: dougbrn

src/nested_pandas/series/nestedseries.py

@@ -71,16 +71,11 @@ def __setitem__(self, key, value):
         if not isinstance(self.dtype, NestedDtype):
             return super().__setitem__(key, value)
 
-        # Set a single field from a value
+        # Use nest setitem when setting on a single field
         if isinstance(key, str) and key in self.fields:
             self.nest[key] = value
             return
 
-        # Set a single field from a Series
-        if isinstance(key, pd.Series) and key.dtype == self.dtype:
-            self.nest[key] = value
-            return
-
         return super().__setitem__(key, value)
 
     @nested_only