BUG: make Series handle dtype='int64' for string array

 closes #44923

Author: 5j9

pandas/core/dtypes/cast.py

@@ -1851,6 +1851,9 @@ def maybe_cast_to_integer_array(
     # doesn't handle `uint64` correctly.
     arr = np.asarray(arr)
 
+    if is_string_dtype(arr):
+        return casted
+
     if is_unsigned_integer_dtype(dtype) and (arr < 0).any():
         raise OverflowError("Trying to coerce negative values to unsigned integers")
 

pandas/tests/series/test_constructors.py

@@ -1880,6 +1880,12 @@ def test_constructor_bool_dtype_missing_values(self):
         expected = Series(True, index=[0], dtype="bool")
         tm.assert_series_equal(result, expected)
 
+    def test_constructor_int64_dtype(self, any_int_dtype):
+        # GH#44923
+        result = Series(["0", "1", "2"], dtype=any_int_dtype)
+        expected = Series([0, 1, 2], dtype=any_int_dtype)
+        tm.assert_series_equal(result, expected)
+
     def test_constructor_dtype_timedelta_alternative_construct(self):
         # GH#35465
         result = Series([1000000, 200000, 3000000], dtype="timedelta64[ns]")