[Mailman-Developers] Handling additions to REST API in client side

[Stephen J. Turnbull]

Abhilash Raj writes:

 > How bad do you think would it be for Core to silently drop extra
 > attributes and only use the ones that it needs?

I have no idea what the semantics of that would be.  You'd need to
come up with rules about semantics of adding attributes that guarantee
this works as expected, but if you could, you probably wouldn't need
the new attributes in the first place.

I think it would be better for Core to fail with a reason of unknown
attribute and allow the client to retry.  But if the client isn't
prepared to retry, there's no existing guarantee that the client can
rollback the transaction.  We'll just have to document that clients
need to be prepared to rollback if they use attributes not documented
for the version they require.

Of course this is mitigated by the fact that in general clients
wouldn't be keeping substantial state anyway.