Fixed a small bug introduced by r62778.
One of the codepaths of _BytesIO.read() returned a bytearray
object, by mistake, when it should always return a bytes object.
Interestingly, the fact this bug shown up probably means that
some platforms are not using the new C-accelerated io.BytesIO.
diff --git a/Lib/io.py b/Lib/io.py
index 3a1546a..a88b5a4 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -794,7 +794,7 @@
if n < 0:
n = len(self._buffer)
if len(self._buffer) <= self._pos:
- return self._buffer[:0]
+ return bytes(self._buffer[:0])
newpos = min(len(self._buffer), self._pos + n)
b = self._buffer[self._pos : newpos]
self._pos = newpos