Use "formatversion: 2" in notification fetching
Use "formatversion: 2" in notification fetching

This means booleans are actually true/false rather than value or
empty-string.

Bug: T175867
Change-Id: I3d33129d061a64012602a131741d20e2ff97d1be

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