A large amount of errors (8,345 in last 7 days, top error on mobile web) are occurring relating to this issue. The majority coming from the gadget https://en.wikipedia.org/w/index.php?title=MediaWiki:Gadget-EditNoticesOnMobile.js
https://logstash.wikimedia.org/goto/72d06e4268576413761281470b4a00cc
Perhaps we should require a check for Object.values as part of our grade A support ?
The user agents don't completely match up with https://caniuse.com/object-values so it's possible something else is playing a part here. Majority of issues appearing in `Mozilla/5.0 (iPhone; CPU iPhone OS 13_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Mobile/15E148 Safari/604.1` despite caniuse says the function should be available there.