TIL that int(b'hex', 16) works fine on Python 3

src/zope/server/http/chunking.py

@@ -68,7 +68,7 @@ def received(self, s):
                         if semi >= 0:
                             # discard extension info.
                             line = line[:semi]
-                        sz = int(line.strip().decode(), 16)  # hexadecimal
+                        sz = int(line.strip(), 16)  # hexadecimal
                         if sz > 0:
                             # Start a new chunk.
                             self.chunk_remainder = sz