use simpler dtype for intervals

jreback · jreback · commit 2dfab280186a · 2018-06-25T06:27:37.000-04:00
diff --git a/pandas/core/indexes/interval.py b/pandas/core/indexes/interval.py
@@ -804,7 +804,7 @@ def astype(self, dtype, copy=True):
     @cache_readonly
     def dtype(self):
         """Return the dtype object of the underlying data"""
-        return IntervalDtype(str(self.left.dtype))
+        return IntervalDtype(self.left.dtype.name)
 
     @property
     def inferred_type(self):
