Middleware Argument type

[matt-taylor]

#5311

---

v6.4.2 introduced breaking changes to the argument types of the middleware client.

[danielvdao]

I could be wrong, but I think we need to add items["class"] to push_bulk as well, otherwise the middleware only gets invoked in one spot. Here's a code example.

[mperham]

Yes, you're missing a similar change in push_bulk.

[mperham]

Thank you, especially for the regression test!