Since Python 3 makes clear the distinction between bytes and string, there is no more reason to use the xmlrpc.client.Binary wrapper for binary objects.

The xmlrpc library may deal with bytes and bytearray normally.
To support backward compatibility, the ServerProxy will have a keyword argument "use_bytes" similar to the "use_datetime" from issue #1120353.

Updated with documentation.

Ooops wrong patch.

Maybe a flag "use_builtin_types" is preferred?
It should implies both `bytes` and `datetime.datetime` are used for presenting data received.

I don't see a use case where we would like to have `bytes` for binary data but keep `xmlrpc.client.DateTime` for date objects.

Becomes obsolete, if this change is done:
 - xmlrpc.client.Binary
 - xmlrpc.client.DateTime
 - use_datetime flag of `ServerProxy` class and `loads` function

I'm not sure it's necessary to deprecate things here.

This patch v3 implements the proposal of use_builtin_types flag.
In this case the use_datetime flag becomes obsolete.

Please comment.

I made comments on Rietveld but there was a glitch, I’m not sure the email was sent.

Thank you for your comments.
Uploaded a new version.

New changeset 0175883d9513 by Florent Xicluna in branch 'default':
Closes #13297: use bytes type to send and receive binary data through XMLRPC.
http://hg.python.org/cpython/rev/0175883d9513