Hygiene: Convert value to constant and clarify outlier use case
Hygiene: Convert value to constant and clarify outlier use case

Change-Id: I7a82fa99b41362368a9f58cfb84241cca97bfb15

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo