+&$summary: CommentStoreComment object containing the edit comment. Can be replaced with a new one.
+$isminor: Boolean flag specifying if the edit was marked as minor.
+$iswatch: Previously a watch flag. Currently unused, always null.
+$section: Previously the section number being edited. Currently unused, always null.
+$flags: All EDIT_… flags (including EDIT_MINOR) as an integer number. See WikiPage::doEditContent
+ documentation for flags' definition.
+$status: StatusValue object for the hook handlers resulting status. Either set $status->fatal() or
+ return false to abort the save action.