The standard `repr` for a `Series` shows the index name: ``` repr(pd.Series([1], index=pd.Index(["a"], name="idx"))) ``` ``` idx a 1 dtype: int64 ``` but `to_string` does not: ``` pd.Series([1], index=pd.Index(["a"], name="idx")).to_string(name=True) ``` ``` a 1 ```