Feature summary:
When a <pages> tag is malformed, that is, it contains mispelt parameters, it fails without warning and sometimes can be difficult to check where is the issue. I would like to track instances of <pages> tags that contain invalid or misspelt parameter names. As far as I can tell, valid parameter names are "index", "from," "to", "step", "include", "exclude", "fromsection", "tosection", "onlysection", "header" and whatever parameters from MediaWiki:Proofreadpage index data config are set with value header: true.

Use case(s):
Provide maintenance for misspelt pages tag

Benefits:
Allows for tracking of misspelt pages tag