Edwin Cromley

> We'd actually be unifying on sanitize_callback instead, as validate_callback can be implemented on top of sanitize_callback, but the opposite is not true. So for an argument's schema you would...

Should this somehow apply to the get callback or does #2702 take care of the issue entirely?

If someone could double check me that would be great too, as the capabilities in WordPress can often be confusing.

https://github.com/qubyte/fetch-ponyfill This is another library to consider using. It is a slightly cleaner approach and involves less things to worry about.

> I see the parameters - but no examples of them in action. Is there a general query code style that is already assumed? Is the syntax the same as...

The initial modeling of the schema is in #24, and `prepare_item_for_response()` is already in.

I forgot our CI runs both multisite and single site tests in one go. The second commit adds in multisite permissions checks for plugins; matching WordPress core.

This is good to merge the failing tests are unrelated. This fix is in here #23.