COMPAT: numpy-dev compat on bool(dtype) change

xref numpy/numpy#8279

closes pandas-dev#15199

Author: jreback

pandas/core/ops.py

@@ -444,13 +444,15 @@ def _convert_to_array(self, values, name=None, other=None):
         supplied_dtype = None
         if not is_list_like(values):
             values = np.array([values])
+
         # if this is a Series that contains relevant dtype info, then use this
         # instead of the inferred type; this avoids coercing Series([NaT],
         # dtype='datetime64[ns]') to Series([NaT], dtype='timedelta64[ns]')
         elif (isinstance(values, pd.Series) and
               (is_timedelta64_dtype(values) or is_datetime64_dtype(values))):
             supplied_dtype = values.dtype
-        inferred_type = supplied_dtype or lib.infer_dtype(values)
+
+        inferred_type = lib.infer_dtype(values)
         if (inferred_type in ('datetime64', 'datetime', 'date', 'time') or
                 is_datetimetz(inferred_type)):
             # if we have a other of timedelta, but use pd.NaT here we