Issue #24608: chunk.Chunk.read() now always returns bytes, not str.

Lib/chunk.py

@@ -128,7 +128,7 @@ class Chunk:
         if self.closed:
             raise ValueError("I/O operation on closed file")
         if self.size_read >= self.chunksize:
-            return ''
+            return b''
         if size < 0:
             size = self.chunksize - self.size_read
         if size > self.chunksize - self.size_read:

Misc/NEWS

@@ -17,6 +17,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #24608: chunk.Chunk.read() now always returns bytes, not str.
+
 - Issue #18684: Fixed reading out of the buffer in the re module.
 
 - Issue #24259: tarfile now raises a ReadError if an archive is truncated