simplify is_hashable

Author: mroeschke

pandas/core/dtypes/inference.py

@@ -356,19 +356,7 @@ def is_hashable(obj) -> TypeGuard[Hashable]:
     >>> is_hashable(a)
     False
     """
-    # Unfortunately, we can't use isinstance(obj, collections.abc.Hashable),
-    # which can be faster than calling hash. That is because numpy scalars
-    # fail this test.
-
-    # Reconsider this decision once this numpy bug is fixed:
-    # https://github.com/numpy/numpy/issues/5562
-
-    try:
-        hash(obj)
-    except TypeError:
-        return False
-    else:
-        return True
+    return isinstance(obj, abc.Hashable)
 
 
 def is_sequence(obj) -> bool: