Fix side effects

Author: heoh

pandas/core/dtypes/cast.py

@@ -1086,10 +1086,7 @@ def convert_dtypes(
             elif (
                 infer_objects
                 and input_array.dtype == object
-                and (
-                    isinstance(inferred_dtype, str)
-                    and inferred_dtype == "mixed-integer-float"
-                )
+                and inferred_dtype == "floating"
             ):
                 inferred_dtype = pandas_dtype_func("Float64")
 

pandas/tests/extension/test_arrow.py

@@ -3090,7 +3090,7 @@ def test_infer_dtype_pyarrow_dtype(data, request):
     res = lib.infer_dtype(data)
     assert res != "unknown-array"
 
-    if data._hasna and res in ["floating", "datetime64", "timedelta64"]:
+    if data._hasna and res in ["datetime64", "timedelta64"]:
         mark = pytest.mark.xfail(
             reason="in infer_dtype pd.NA is not ignored in these cases "
             "even with skipna=True in the list(data) check below"