My fault here:
As required by me
https://github.com/Islandora/islandora_paged_content/pull/120 removed all sanitizing since the value was previously being passed through t() and other dry cleaning operations.
But: Drupal Coding Standards enforced by phpcs expected those operations to happen inline, at that particular form array key value, resulting in
So i will have to go back to Patrick Dunlavey original proposed code (sorry) to allow Travis to pass. This will required (release times) two pull requests.