Steps to reproduce

• configure pagetriage to display copyright status by installing ORES and setting $wgPageTriageEnableOresFilters to true. follow this procedure
• visit http://localhost:8080/wiki/Special:ApiSandbox, and use the pagetriagetagcopyvio API to tag the newest revision of an unreviewed page as a copyright violation
• install Vue.js devtools browser extension
• visit visit http://localhost:8080/wiki/Special:NewPagesFeed
• open DevTools
• change the Special:NewPagesFeed filter settings a couple times, making sure that the page that was marked as a copyright violation is included in the feed

What happens?

[Vue warn]: Invalid prop: type check failed for prop "copyvio". Expected Number with value 118, got String with value "118". 
  at <ListItem afdStatus=false blpProdStatus=false csdStatus=false  ... > 
  at <ListContent tb-version=null >

What should happen instead?

No console warnings