From 4badd3532504bc48770e4ef0cfe38e57bc51dda5 Mon Sep 17 00:00:00 2001
From: "Michael J. Sullivan" <sully@msully.net>
Date: Tue, 23 Oct 2018 16:13:07 -0700
Subject: [PATCH] Allow json.dump to dump to BinaryIO again (#2546)

PR #2516 aimed to widen the accepted file argument to json.dump, but
since `IO` is invariant in its argument, it actually disallowed
passing binary files.
---
 stdlib/2/json.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/2/json.pyi b/stdlib/2/json.pyi
index 62b917e9e..5b70217a1 100644
--- a/stdlib/2/json.pyi
+++ b/stdlib/2/json.pyi
@@ -20,7 +20,7 @@ def dumps(obj: Any,
     **kwds: Any) -> str: ...
 
 def dump(obj: Any,
-    fp: IO[Text],
+    fp: Union[IO[str], IO[Text]],
     skipkeys: bool = ...,
     ensure_ascii: bool = ...,
     check_circular: bool = ...,