From c607456d9eac8743e5280adeec5496fd2621ae6a Mon Sep 17 00:00:00 2001
From: Eric Wieser <wieser.eric@gmail.com>
Date: Thu, 27 Apr 2017 23:01:49 +0100
Subject: MAINT: Remove weird create-a-copy dance

---
 numpy/lib/nanfunctions.py | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'numpy/lib/nanfunctions.py')

diff --git a/numpy/lib/nanfunctions.py b/numpy/lib/nanfunctions.py
index c96e925aa..d9df9563f 100644
--- a/numpy/lib/nanfunctions.py
+++ b/numpy/lib/nanfunctions.py
@@ -61,14 +61,10 @@ def _replace_nan(a, val):
         NaNs, otherwise return None.
 
     """
-    is_new = not isinstance(a, np.ndarray)
-    if is_new:
-        a = np.array(a)
+    a = np.array(a, subok=True, copy=True)
+
     if not issubclass(a.dtype.type, np.inexact):
         return a, None
-    if not is_new:
-        # need copy
-        a = np.array(a, subok=True)
 
     mask = np.isnan(a)
     np.copyto(a, val, where=mask)
-- 
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