I propose this change:

- set `page.text` to `None` to discard changes
- delete `page.text` to reload content -- equivalent to get(force=True)
- in Page.save(), if `page.text` is equal to unchanged text, no API call
- to touch a page, use page.touch(), which will call action="edit" & appendtext="", instead. The advantage is that there is no need to preload text.

Sorawee Porncharoenwase