Last modified: 2013-02-02 01:47:09 UTC
This is spotted in the latest master branch from core and pagetriage. When changing the filter option, it throws this warning in the API response: {"warnings":{"options":{"*":"Validation error for 'NewPagesFeedFilterOptions': not a valid preference"}},"options":"success"} Looks like this is a side-effect from this API change: https://gerrit.wikimedia.org/r/#/c/37503/ "arbitrary preferences' names must start with userjs- prefix, to avoid any possibility of conflicting with new MediaWiki versions or extensions."
Fixed in https://gerrit.wikimedia.org/r/#/c/47196/