Just to note in general to add onto this, it may take a couple of days for instances to update once 0.19.5 comes out - especially since I believe AFAIK it can break third party applications using the API if they're not updated. So some instances may wait for the bigger apps to update, before they update.
And of course, in general most instances like to test the update on say, a replica, just to ensure that there is no breakage during an update.
Looks great! I appreciate your hard work that you've put into Summit!