From cb90e32330eae1c4e693af35c0dec270c1571920 Mon Sep 17 00:00:00 2001
From: arw2019 <andrew.r.wieteska@gmail.com>
Date: Sun, 11 Oct 2020 17:10:34 +0000
Subject: [PATCH] feedback: add assert to maybe_castable

---
 pandas/core/dtypes/cast.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pandas/core/dtypes/cast.py b/pandas/core/dtypes/cast.py
index fdaff66a4f50a..3797e28f63e80 100644
--- a/pandas/core/dtypes/cast.py
+++ b/pandas/core/dtypes/cast.py
@@ -1286,6 +1286,8 @@ def convert_dtypes(
 def maybe_castable(arr: np.ndarray) -> bool:
     # return False to force a non-fastpath
 
+    assert isinstance(arr, np.ndarray)  # GH 37024
+
     # check datetime64[ns]/timedelta64[ns] are valid
     # otherwise try to coerce
     kind = arr.dtype.kind