BUG: cast mask back to bool (hack)

Author: wesm

pandas/src/tseries.pyx

@@ -442,7 +442,7 @@ def maybe_indices_to_slice(ndarray[int64_t] indices):
     return slice(indices[0], indices[n - 1] + 1)
 
 
-def maybe_booleans_to_slice(ndarray[uint8_t, cast=True] mask):
+def maybe_booleans_to_slice(ndarray[uint8_t] mask):
     cdef:
         Py_ssize_t i, n = len(mask)
         Py_ssize_t start, end
@@ -451,7 +451,7 @@ def maybe_booleans_to_slice(ndarray[uint8_t, cast=True] mask):
     for i in range(n):
         if mask[i]:
             if finished:
-                return mask
+                return mask.view(np.bool_)
             if not started:
                 started = 1
                 start = i

pandas/tests/test_tseries.py

@@ -186,6 +186,12 @@ def test_duplicated_with_nas():
     expected = trues + falses
     assert(np.array_equal(result, expected))
 
+def test_maybe_booleans_to_slice():
+    arr = np.array([0, 0, 1, 1, 1, 0, 1], dtype=np.uint8)
+    result = lib.maybe_booleans_to_slice(arr)
+    assert(result.dtype == np.bool_)
+
+
 def test_convert_objects():
     arr = np.array(['a', 'b', nan, nan, 'd', 'e', 'f'], dtype='O')
     result = lib.maybe_convert_objects(arr)